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Old 04-10-2008, 02:01 PM   #1
choiboi
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Default time for tranny oil change?

I have 30k miles now and i'm a pretty spirited driver. I can really say my tranny has a lot of resistance compared to a new wrx with about 15k miles. Is it time for tranny oil change?
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Old 04-10-2008, 02:20 PM   #2
vashachiroku
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I just bought an 06 with less than 1500 miles and I'm already change the tranny fluid to AMSOIL 75w90 Sever gear. I'm not 100% sure what the OEM maintence is, but if your drive hard change out the fluid to synthetic is a good idea.

Also bought it for the Front and Rear diff too.
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Old 04-14-2008, 08:03 PM   #3
prometheum
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Quote:
Originally Posted by vashachiroku View Post
I just bought an 06 with less than 1500 miles and I'm already change the tranny fluid to AMSOIL 75w90 Sever gear. I'm not 100% sure what the OEM maintence is, but if your drive hard change out the fluid to synthetic is a good idea.

Also bought it for the Front and Rear diff too.
i'm not sure you should run severe gear in your transmission, its a hypoid gear oil which contains extreme pressure additives which are really bad for yellow metals like your synchros
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Old 04-14-2008, 09:06 PM   #4
mikeythejew
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The best gear oil you can get imo is supertech semi synthetic 75W90 from wal-mart. Distributed by this company http://wd-wpp.com/specsheet/75w90.pdf I presume. The fluid is sold under different name brands.

Quiz: Why does this fluid have better shift qualities then other gear oils incl Extra-S?
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Old 04-15-2008, 10:14 AM   #5
bluesubie
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Quote:
Originally Posted by prometheum View Post
i'm not sure you should run severe gear in your transmission, its a hypoid gear oil which contains extreme pressure additives which are really bad for yellow metals like your synchros
All GL-5's contain Extreme Pressure additives.
Gear Tribology and Lubrication article on bitog.
Gear Tribology and Lubrication Part II.

-Dennis
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Old 04-15-2008, 01:35 PM   #6
bulwnkl
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Quote:
Originally Posted by prometheum View Post
i'm not sure you should run severe gear in your transmission, its a hypoid gear oil which contains extreme pressure additives which are really bad for yellow metals like your synchros
This is really, really, really out of date 'info.' Modern, reasonable-quality GL-5 gear oils all have plenty of metal deactivators to make this a complete non-issue. Besides which, the 5MT in a Subaru contains a hypoid differential which really needs a hypoid gear oil for proper protection.
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Old 04-10-2008, 05:28 PM   #7
drivin blind
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^^^^^ This is terrible info. Do NOT put synthetic in a 5mt. Search. Rear, whatever you want. Our trannys are very picky. RP
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Old 04-10-2008, 05:52 PM   #8
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Quote:
Originally Posted by drivin blind View Post
^^^^^ This is terrible info. Do NOT put synthetic in a 5mt.
I've been running synthetic in my 5 mt Subaru tranny's since 1998.

-Dennis
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Old 04-10-2008, 06:08 PM   #9
leecea
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It's a very easy process, so I'd do it. I have changed mine a few of times to get something I like. I started with an 80w90 dino oil and didn't like it much. Then I discovered 75w90 StaLube at my local PepBoys and like it. Not sure if it still available - I bought a couple of gallons years ago, so I've been good for a while now.

Have you checked your tranny level? Mine was low from the factory which caused me a bit of a panic at the time, but I hear it was common on the 02-03s.
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Old 04-11-2008, 02:59 AM   #10
06grayrex
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Quote:
Originally Posted by drivin blind View Post
^^^^^ This is terrible info. Do NOT put synthetic in a 5mt. Search. Rear, whatever you want. Our trannys are very picky. RP

I'm sorry but you are way off base, then under the same breath you recommend a synthetic by RP..Are you kidding me.

To the OP your transmission will love Amsoil's Severe Gear 75w90

Last edited by 06grayrex; 04-11-2008 at 04:56 AM.
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Old 04-11-2008, 12:56 PM   #11
my scoop eats babies
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Quote:
Originally Posted by drivin blind View Post
^^^^^ This is terrible info. Do NOT put synthetic in a 5mt. Search. Rear, whatever you want. Our trannys are very picky. RP


Care to elaborate? I've always used synthetic in my 5mt, I've seen a 5mt subie run for over 250k miles on synthetic, and I know several people with subies that will use nothing but synthetic in their 5mt. Maybe specific brands and/or weights, but I've never heard of a synthetic damaging a 5mt strictly because it was a synthetic oil.
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Old 04-11-2008, 12:49 PM   #12
drivin blind
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Sorry about that.The RP at the end are my initials. Meant to say, It doesn't really matter syn. or dyno in rear end.
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Old 04-11-2008, 01:21 PM   #13
Psydotek
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I've been running Neo Synthetic HD 75w90 for the last 100k miles on my WRX. I'm at 130k miles on the odometer now.

Mobil 1 75w90 goes into the rear differential.
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Old 04-12-2008, 12:09 AM   #14
JamesWilson
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OH MY GOD.

Made the switch to the AMSOIL Severe Gear 75w-110 gearbox and diff oil today. Holy Crap! Nice smooth shifting, about half the gear noise (even my passengers commented, "what did you do to this thing?"), and should take the abuse. This is coming from a fairly short run of Motul Gear 300 full synthetic, that was changed between the Pro Finale and Solo Nationals last year (so about 10 autocrosses and one ProSolo, all with multiple drivers...no real "winter" downtime here.... and about 10K street miles). By comparison, the Motul would be notchy when "cold", start feeling okay but noisy, get really noisy when hot, and then finally get more notchy. Screw that. The oil that came out was dark but not stinky, and there was only the standard grey paste on the drain bolt magnet, no shards...so I guess the Motul was doing its job, but loud as heck and no fun to shift.

Anyway, +a million on the Severe Gear, whatever weight you choose.
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Old 04-13-2008, 06:55 PM   #15
JnJassociates
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Amsoil Severe Gear as well... We use what we sell.

Bryan
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Old 04-14-2008, 03:00 PM   #16
JamesWilson
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More driving around today, it's about 80 degrees out right now (in San Diego). Transmission keeps feeling better and better with the Severe Gear 75w-110 in it. Also did a transmission service in my wife's '97 Accord (203K miles V6 auto) with their ATF, feels great also, and use the rest for my power steering in the Impreza.

Good products, there should be more local brick-and-mortar stores that carry them to make them more accessible.
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Old 04-14-2008, 04:41 PM   #17
lawn boy
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can you get severe gear at any of the bigger auto parts chains (advance, autozone)?
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Old 04-14-2008, 06:19 PM   #18
JamesWilson
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Quote:
Originally Posted by lawn boy View Post
can you get severe gear at any of the bigger auto parts chains (advance, autozone)?
Only privately-owned smaller stores (certain non-corporate NAPA, Car Quest, etc.) will carry it. If there is a NASIOC Vendor that has it, I would give them the business. Otherwise I think you can order direct off of the AMSOIL web site at http://www.amsoil.com/StoreFront/default.aspx, word has it there is a price increase/surcharge May 1st, or so the dealer who I got mine from says.
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Old 04-15-2008, 02:23 AM   #19
JamesWilson
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Not sure why it is good, just feels good versus the Motul Gear 300 and LubroMoly that I had been running in the past, and a lot quieter. In theory another high-solids oil like Shockproof should behave the same.

Amsoil's test that they flaunt shows the least amount of corrosion to these metals over two handfulls of other brands, so I figured why not go for it.

I was actually considering the Wal-Mart brand oil as mentioned many times by mikeythejew, but the Amsoil guy was closer and I actually had some cash on me, so decided to risk it.
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Old 04-15-2008, 07:43 AM   #20
mopartodd
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+ whatever # we're up for the Amsoil Severe Gear Lube. Changed it at 2,000 miles on the odometer. Increased my mileage by 1 MPG and I didn't notice any different feel to the tranny.
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Old 04-15-2008, 10:23 AM   #21
Illsti
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Synthetic is too slippery for the synchros, you will most likely grind gears when shifting hard..
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Old 04-16-2008, 09:53 AM   #22
06grayrex
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Quote:
Originally Posted by Illsti View Post
Synthetic is too slippery for the synchros, you will most likely grind gears when shifting hard..
So do you want a fluid that causes more friction, heat, and wear, and to boot hurts fuel economy? To make blanket statement saying that synthetic is too slippery for the synchros and is most likely cause someone to grind grears is ill advised. Grinding gears is cause by not having the clutch depressed enough before someone tries to force the gear change (which is also called abuse), or by a fluid that is broken down or has so much contamination in it (because of the forced shifts/gear grinding) to the point where it is not lubricating properly causing even more wear..

Last edited by 06grayrex; 04-16-2008 at 10:29 AM.
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Old 05-05-2008, 09:56 PM   #23
MOS DEF
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i sadly got around to changing my tranny oil around the 60k mark.. i threw Royal Purple in and its straight! super smooth shifting all day, compared to what things were like prior to. haven't tried amsoil, but a lot of good praise from our members. if i didnt go Royal Purple, i would have went w/ Motul. eh.. just my .02.. no grinding or trouble w/ my shifting either..

good luck!

-jaz
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Old 05-14-2008, 12:31 AM   #24
rice_balls
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I've been looking for information about using amsoil in the tranny on our cars! This answers all my questions... Amsoil will be going in to the transmission and the differential soon
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Old 04-15-2008, 12:41 PM   #25
bluesubie
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See post #4. You really can't make generalizations like that. Maybe it's too slippery for you and you grind gears when shifting too hard.

-Dennis
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