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#1 2012-03-04 02:01:12

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Best Auto & Diff Oil?

What oils do you guys run in the rear and tranny on your 4EAT Aeros?

Thanks,
Nick

Last edited by VR4ownzU (2012-08-07 10:25:52)


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#2 2012-03-04 09:55:19

Augie
Member
Registered: 2009-01-02
User Number: 3426
Posts: 1695

Re: Best Auto & Diff Oil?

Rear Diff Mobil1 75W90 Works really well but dont put it in your manual tranny(or anything with LS or Limited Slip on the can in your tranny)...as for the Auto Trans Fluid Im not up on that.  I have a Manual and I have been using  Valvoline 75w90 and change ever 20k miles. cheap easy works well.

Im actually about due for a tranny fluid change, Did some reading over at Bobistheoilguy and other Subi sites. Looks like Supertech(wally world brand) full synthetic 75w90 is going in this morning. cheaper than  Valvoline 75w90 and from the anecdotal info ive seen works well, It is a GL5 oil with no LSD modifiers for those of us with Manuals.

about to head over and pick up 4 quarts will update in a few hundred miles
Just to add the Manual uses a T70 drive bit to remove the drain plug. You can pick em up at most autozones for 3.99

Last edited by Augie (2012-03-04 12:01:21)


05' Saab 92x Aero OBP Standard Stage 2
Yes, some mod messed with my profile and Im cranky because of the passive aggressive nature of this

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#3 2012-03-04 11:03:52

tonka92x
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Registered: 2005-05-12
User Number: 17
Posts: 4170

Re: Best Auto & Diff Oil?

I use Amsoil 75W-90 Synthetic Long Life in the diff and transmission (5MT), there's no reason it couldn't be used in the front diff as well.  Don't know what works best in the 4EAT.

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#4 2012-03-04 14:59:13

laxian55
Member
Registered: 2011-11-16
User Number: 6359
Posts: 58

Re: Best Auto & Diff Oil?

Just changed mine with oem subaru ATF per my buddies recommendation that is a Subie Tech. He ran redline in his diffs when he had an RSTI and recommended that to me.

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#5 2012-03-04 15:22:27

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Re: Best Auto & Diff Oil?

Can anyone tell me how much oil I'll need for the tranny and rear diff?  The front takes a filter?


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#6 2012-03-05 06:23:47

thymighty
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From: Indianapolis, IN
Registered: 2010-08-06
User Number: 4733
Posts: 4727

Re: Best Auto & Diff Oil?

VR4ownzU wrote:

Can anyone tell me how much oil I'll need for the tranny and rear diff?  The front takes a filter?

I don't think the front diff has a filter, but the 4EAT has a filter.   I used about 10 quarts of the OEM Subaru ATF in the trans.  One the third drain, I replaced the filter.  I bought all of my fluid and filter through a dealer, and had to provide my VIN # to get the correct filter (apparently not all 4EATS use the same filter.) 
The dipstick/fill tube for the front diff is on the passenger side, and the dipstick/fill tube for the 4EAT is on the driver side.

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#7 2012-03-05 06:40:27

Rtom
Member
From: Vancouver
Registered: 2010-01-20
User Number: 4238
Posts: 86

Re: Best Auto & Diff Oil?

Any synthetic ATF in the automatic transmission will do, so long as it's Dexron III. Capacity is at ~10L, but don't expect to get that much out if you're doing a drain and refill.
The automatic transmission filter is service free, but if you do plan on changing it you can get the filter at your local subie dealer.

For the front and rear diffs, GL-5 75w-90 synthetic gear oil, Capacity for the front is ~1L and the rear is ~1L.


2005 Saab 9-2x Aero 4EAT
Desert Silver Metallic

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#8 2012-07-22 10:30:43

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Re: Best Auto & Diff Oil?

Renewing this post since I haven't done it yet.  Any of you guys run Redline?  Which one for a stock 4EAT?  http://www.redlineoil.com/Products.aspx?pcid=9


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#9 2012-07-22 11:50:58

Augie
Member
Registered: 2009-01-02
User Number: 3426
Posts: 1695

Re: Best Auto & Diff Oil?

Rdline, overpriced same as much else out there.


05' Saab 92x Aero OBP Standard Stage 2
Yes, some mod messed with my profile and Im cranky because of the passive aggressive nature of this

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#10 2012-08-06 13:44:15

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Re: Best Auto & Diff Oil?

anybody else?


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#11 2012-08-06 15:25:39

Homyality
Member
From: East Texas
Registered: 2012-05-22
User Number: 7259
Posts: 782

Re: Best Auto & Diff Oil?

I run a four part mix.

Royal purple for 2, redline shockproof for 1, synchro mesh for 1.

Many people on NASIOC have a lot of evidence and swear by this mixture, and ones like it, although most people run 2 parts Castrol GTX over RP.


2005 Saab 92x Aero (Cobb Stage 3)
Wiseco Pistons - Wiseco Rods - ACL Bearings - Updated 2.0 Crank - ARP Studs
VF 39 - STi TMIC - STi Blues - HKS DP - Invida Q200 Catback
Grimmspeed AOS

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#12 2012-08-06 15:37:29

iamchris
Site Owner
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From: Rochester, NY
Registered: 2006-02-22
User Number: 1032
Posts: 22759
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Re: Best Auto & Diff Oil?

Homyality wrote:

I run a four part mix.

Royal purple for 2, redline shockproof for 1, synchro mesh for 1.

Many people on NASIOC have a lot of evidence and swear by this mixture, and ones like it, although most people run 2 parts Castrol GTX over RP.

I'm not surprised that your "evidence" is all unsubstantiated hearsay.

Check out actual scientific tests on the Uncle Scotty's Cocktail: http://forums.nasioc.com/forums/showthr … ?t=1489327

This is laughably reminiscent of another topic that you like to talk about on here.


Anyways, the OP and VR4 were both asking about automatic transmissions.  Nice reading.  up

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#13 2012-08-07 04:20:19

Homyality
Member
From: East Texas
Registered: 2012-05-22
User Number: 7259
Posts: 782

Re: Best Auto & Diff Oil?

Already talked to VR4 off this website. The OP wasn't specific in what he was looking for.

I also am not running Scottys blend, good try though.


2005 Saab 92x Aero (Cobb Stage 3)
Wiseco Pistons - Wiseco Rods - ACL Bearings - Updated 2.0 Crank - ARP Studs
VF 39 - STi TMIC - STi Blues - HKS DP - Invida Q200 Catback
Grimmspeed AOS

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#14 2012-08-07 10:25:34

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Re: Best Auto & Diff Oil?

says auto AERO but I'll change it to 4EAT.


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#15 2012-08-07 12:37:20

thymighty
MFWIC
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From: Indianapolis, IN
Registered: 2010-08-06
User Number: 4733
Posts: 4727

Re: Best Auto & Diff Oil?

Homyality wrote:

Already talked to VR4 off this website. The OP wasn't specific in what he was looking for.

I also am not running Scottys blend, good try though.

confused The title of the thread is: "Best Auto & Diff Oil?"  Seems pretty straightforward to me.

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#16 2012-08-07 14:43:02

phillipj
Registered Architect
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From: Chicago IL, 60622
Registered: 2007-10-29
User Number: 2348
Posts: 9297

Re: Best Auto & Diff Oil?

Aside from the infighting...

OP: I use Amsoil for both auto and diff and the car has run great. Obviously just make sure to put in the correct amount, you'll be good to go.
I change the filter whenever I do my auto fluid and I am convinced there is no difference between the subaru one from the dealer and the one can get from your local autozone. My fluid was changed at 30, 62, and 85k miles (just recently). I plan to keep doing so at ~20k intervals all things being equal.


Protuned Automatic Stage 3+ with ProTorque Modified Torque Converter

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#17 2012-08-07 18:28:09

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Re: Best Auto & Diff Oil?

phillipj wrote:

Aside from the infighting...

OP: I use Amsoil for both auto and diff and the car has run great. Obviously just make sure to put in the correct amount, you'll be good to go.
I change the filter whenever I do my auto fluid and I am convinced there is no difference between the subaru one from the dealer and the one can get from your local autozone. My fluid was changed at 30, 62, and 85k miles (just recently). I plan to keep doing so at ~20k intervals all things being equal.

Which exact Amsoil do you put in?  Do you have to drop the tranny or anything crazy to change the filter?  Is it worth changing?  I thought the filter was maintenance free?  I just had the fluid checked today on the trans and diffs and they said it was really clean and not worth changing.  Car now has close to 52500 and I don't know if it has ever been changed.  We bought it 5 months ago.  I just wonder if I would be wasting my money changing all these fluids.


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#18 2012-08-07 20:16:07

Homyality
Member
From: East Texas
Registered: 2012-05-22
User Number: 7259
Posts: 782

Re: Best Auto & Diff Oil?

Serious face:

It's something that really doesn't have to be changed often. If a place that usually begs for your money said it looks good, it looks good.

However, if you do decide to do it, there are quite a few threads on NASIOC, but here's a quick how to on what to do.


1. Put car up on jackstands or a lift
2. Remove drain plug and drain old fluid. Reinstall drain plug.
(now would be a good time to do the rear diff, too)
3. Lower car and add new fluid via a funnel in the dipstick tube.
4. Make sure not to overfill, I believe the tranny holds less than 4QT total.

I'm sure it's the same for an auto.


2005 Saab 92x Aero (Cobb Stage 3)
Wiseco Pistons - Wiseco Rods - ACL Bearings - Updated 2.0 Crank - ARP Studs
VF 39 - STi TMIC - STi Blues - HKS DP - Invida Q200 Catback
Grimmspeed AOS

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#19 2012-08-07 20:25:01

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Re: Best Auto & Diff Oil?

Homyality wrote:

Serious face:

It's something that really doesn't have to be changed often. If a place that usually begs for your money said it looks good, it looks good.

However, if you do decide to do it, there are quite a few threads on NASIOC, but here's a quick how to on what to do.


1. Put car up on jackstands or a lift
2. Remove drain plug and drain old fluid. Reinstall drain plug.
(now would be a good time to do the rear diff, too)
3. Lower car and add new fluid via a funnel in the dipstick tube.
4. Make sure not to overfill, I believe the tranny holds less than 4QT total.

I'm sure it's the same for an auto.

The 4EAT holds 10 quarts so not even close.  Keep the manual tranny stuff out of my thread please.


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#20 2012-08-08 11:26:20

Bryan
why don't you remember my name?
Supporter
From: Western WI
Registered: 2007-01-14
User Number: 1768
Posts: 9574

Re: Best Auto & Diff Oil?

Homyality wrote:

Serious face:

It's something that really doesn't have to be changed often. If a place that usually begs for your money said it looks good, it looks good.

However, if you do decide to do it, there are quite a few threads on NASIOC, but here's a quick how to on what to do.


1. Put car up on jackstands or a lift
2. Remove drain plug and drain old fluid. Reinstall drain plug.
(now would be a good time to do the rear diff, too)
3. Lower car and add new fluid via a funnel in the dipstick tube.
4. Make sure not to overfill, I believe the tranny holds less than 4QT total.

I'm sure it's the same for an auto.

You're a fucking idiot.


I'm cold, and there are wolves after me.

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#21 2012-08-08 12:18:30

thymighty
MFWIC
Supporter
From: Indianapolis, IN
Registered: 2010-08-06
User Number: 4733
Posts: 4727

Re: Best Auto & Diff Oil?

lol  arrow-up
You do get about 3.5 quarts out of the auto at each drain.  I had to drain mine multiple times to cycle out all the old cruddy fluid.

EDIT: I would advise changing 4EAT fluids every 60k miles.  about 55k is when mine started causing problems; hard shifts, sticky gears, hanging revs, etc.

Last edited by thymighty (2012-08-08 12:21:59)

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#22 2012-08-08 13:38:59

phillipj
Registered Architect
Supporter
From: Chicago IL, 60622
Registered: 2007-10-29
User Number: 2348
Posts: 9297

Re: Best Auto & Diff Oil?

VR4ownzU wrote:

phillipj wrote:

Aside from the infighting...

OP: I use Amsoil for both auto and diff and the car has run great. Obviously just make sure to put in the correct amount, you'll be good to go.
I change the filter whenever I do my auto fluid and I am convinced there is no difference between the subaru one from the dealer and the one can get from your local autozone. My fluid was changed at 30, 62, and 85k miles (just recently). I plan to keep doing so at ~20k intervals all things being equal.

Which exact Amsoil do you put in?  Do you have to drop the tranny or anything crazy to change the filter?  Is it worth changing?  I thought the filter was maintenance free?  I just had the fluid checked today on the trans and diffs and they said it was really clean and not worth changing.  Car now has close to 52500 and I don't know if it has ever been changed.  We bought it 5 months ago.  I just wonder if I would be wasting my money changing all these fluids.

For ATF I use the full synth multi-vehicle Amsoil. I personally like that. My car shifts crisply and has always been (I felt) better than the original stuff that was in the car. I also noticed it has been "cleaner" (more red, less brown or blackish, on subsequent changes than the original subaru fluid). For the diff I use the Amsoil 75-90 severe gear stuff, same as most guys here.

I very much dislike that you have to take of the intercooler off on our 92x aero when you change your ATF fluid. Not practical at all. You'll also have to use a really tall and narrow cone fliter with a small tip to to get easy access. Raise the car and remove the plug and also the filter. Filter is simple, just like your normal oil one. I change it to a new one because I am there doing it, but I'm sure you could reuse it a few times based on everything Ive read.

Obviously, when you do a change, you are not going to get it all out, so much of it will hang out in the TC and the valvebody. You are not going to take those out though. If you wanted to be super thorough you could do a change, run the car a bit and do subsequent full changes over the next weeks and and slowly get towards a 100% change. I do not do that as it is prohibitively expensive, time consuming and not enough benefit.

The front diff fill spot (passenger side) is very near to the ATF fill (drivers side) below the IC. Dont forget which is which.

I would change the fluid if I just got a car, simply because you dont 100% know what went on before you. It could be very likely it was never changed, and it should have been at 30k. Even though a small sample might appear clean, that may not necessarily be the case. Try to tap out the filter and hope there is no particles in there. Use a new filter. Start fresh. Buy enough ATF for a full change. I would get the massive container and the rest in small containers. That way you'll have some small guys left over for next time, or you'll likely have enough for two changes. It's not like it'll go bad if you have some extras. I'm always on the play it safe side, though.

Ok that's about it, but feel free to ask me anything about this kind of stuff.  up

Last edited by phillipj (2012-08-08 13:46:31)


Protuned Automatic Stage 3+ with ProTorque Modified Torque Converter

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#23 2012-08-08 14:12:26

krazykarguy
Worst ninja editor, ever.
Supporter
From: South Carolina
Registered: 2007-04-06
User Number: 1944
Posts: 7526

Re: Best Auto & Diff Oil?

What's the front differential capacity on a 4EAT? It must be less than the 5MT, since there are no transmission gears to lubricate as well...

I ran Uncle Scotty's Cocktail in my car from 35k to 60k, and it came out the same smurfy color that went in. I chose USC because I was unfamiliar with how Subaru transmissions shift and feel, and suspected I might have had a problem when my car wouldn't go into 1st gear when I was still rolling forwards. It didn't after the USC fluid change, and still doesn't.  facepalm

I cheaped out and switched to Valvoline 75W/90 on my subsequent change (30k interval), with no improvement to shifting or anything else for that matter.


2005 Aero 5MT, Cold & Premium, Bosal shorty DP, Cobb Stg2 93 oct, Legacy GT 17" wheels, 225/45 Kumho PA31s, ixizhood, Hella Micro DEs, STI Axle back, JDM red hazard switch, VDO boost gauge, aluminum radiator, H6 rear brake upgrade, & giant rally-style mudflaps.

Car # 20 (VIN #0060) - produced 02/04 - one of the "oldest" 9-2x's on the board!

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#24 2012-08-08 14:16:21

VR4ownzU
Member
From: Orlando, FL
Registered: 2010-08-01
User Number: 4714
Posts: 412

Re: Best Auto & Diff Oil?

phillipj wrote:

VR4ownzU wrote:

phillipj wrote:

Aside from the infighting...

OP: I use Amsoil for both auto and diff and the car has run great. Obviously just make sure to put in the correct amount, you'll be good to go.
I change the filter whenever I do my auto fluid and I am convinced there is no difference between the subaru one from the dealer and the one can get from your local autozone. My fluid was changed at 30, 62, and 85k miles (just recently). I plan to keep doing so at ~20k intervals all things being equal.

Which exact Amsoil do you put in?  Do you have to drop the tranny or anything crazy to change the filter?  Is it worth changing?  I thought the filter was maintenance free?  I just had the fluid checked today on the trans and diffs and they said it was really clean and not worth changing.  Car now has close to 52500 and I don't know if it has ever been changed.  We bought it 5 months ago.  I just wonder if I would be wasting my money changing all these fluids.

For ATF I use the full synth multi-vehicle Amsoil. I personally like that. My car shifts crisply and has always been (I felt) better than the original stuff that was in the car. I also noticed it has been "cleaner" (more red, less brown or blackish, on subsequent changes than the original subaru fluid). For the diff I use the Amsoil 75-90 severe gear stuff, same as most guys here.

I very much dislike that you have to take of the intercooler off on our 92x aero when you change your ATF fluid. Not practical at all. You'll also have to use a really tall and narrow cone fliter with a small tip to to get easy access. Raise the car and remove the plug and also the filter. Filter is simple, just like your normal oil one. I change it to a new one because I am there doing it, but I'm sure you could reuse it a few times based on everything Ive read.

Obviously, when you do a change, you are not going to get it all out, so much of it will hang out in the TC and the valvebody. You are not going to take those out though. If you wanted to be super thorough you could do a change, run the car a bit and do subsequent full changes over the next weeks and and slowly get towards a 100% change. I do not do that as it is prohibitively expensive, time consuming and not enough benefit.

The front diff fill spot (passenger side) is very near to the ATF fill (drivers side) below the IC. Dont forget which is which.

I would change the fluid if I just got a car, simply because you dont 100% know what went on before you. It could be very likely it was never changed, and it should have been at 30k. Even though a small sample might appear clean, that may not necessarily be the case. Try to tap out the filter and hope there is no particles in there. Use a new filter. Start fresh. Buy enough ATF for a full change. I would get the massive container and the rest in small containers. That way you'll have some small guys left over for next time, or you'll likely have enough for two changes. It's not like it'll go bad if you have some extras. I'm always on the play it safe side, though.

Ok that's about it, but feel free to ask me anything about this kind of stuff.  up

Which Trans filter do you use?  Do you have any photos or Part#?  I won't be doing the fluid changes myself.  The Mobil 1 place I go to does all the fluid changes.  I believe they hook up something do suck as much out but I could be wrong.  I've read that getting all of it out is bad because you want to keep some of those particiles in there that help it run.  It sounds retarded to me though.  At that point if you change the fluid and the trans is messed your trans was already screwed up.  I'm hoping that a trained tech doesn't have to take the intercooler off to change the fluid.  These guys usually seem to want to upsale me on things and when he checked the trans fluid he said it looked new.  Whether it is I have no idea.


Nick
WTB - 9-2x AERO, 04-08 Forester XT, 02-07 WRX wagon
Wife - 2005 9-2x AERO 4EAT (Deep Blue Mica)  Mine - 2000 Impreza RS 5spd (Silverthorn Metallic)

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#25 2012-08-08 14:32:46

Bryan
why don't you remember my name?
Supporter
From: Western WI
Registered: 2007-01-14
User Number: 1768
Posts: 9574

Re: Best Auto & Diff Oil?

My advice is that if you're not planning on the work, to steer clear of chains and places that upsell.  It sounds like you know these guys, though.  Most service centers do not like when you bring in your own fluids or parts - always a good idea to call and check.  If this car is relatively new to you, and only has <60k, and you don't tend to go through cars every couple of years...then find a local, reputable, independent mechanic.  Mine is fantastic, will do a 1yr warranty on any work done with parts I bring in (provided they are the correct parts), has a good relationship with the local Amsoil dealer as well.  It's a wait to get in, he's fairly priced, and I think his mechanics LIKE to work on unique cars - always some low production number or vintage/antique import in there on the lift.  I use them for the big projects I don't have tools, time, or space for.  Like a trans and diff fluid change...


I'm cold, and there are wolves after me.

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