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Old 04-01-2006, 12:15 PM   #1
alacrity024
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Default mobil 1 gear oil in WRX 5mt?

bought my car with 30k on it.. coming up on 60k.. figure it's time to change the transmission and rear diff fluid.. so i went and bought five quarts of Mobil 1 gear oil, a long funnel and an oil pump. did some searching on here to make sure i had the procedure right and found that a couple people were recommending AGAINST Mobil 1 in the gearbox........

i'm not gonna ****ing break anything am i??





and i posted this here because i am deathly afraid of other forums.
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Old 04-01-2006, 12:18 PM   #2
incorporeal
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I put it in my RS, the transmission blew up 500 miles later, $1800


FTW
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Old 04-01-2006, 12:18 PM   #3
sidewayz
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<---- running mobil1 since day 1. 130k on it never broke anything
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Old 04-01-2006, 12:19 PM   #4
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Quote:
Originally Posted by incorporeal
I put it in my RS, the transmission blew up 500 miles later, $1800


FTW
how many miles on the car when you put it in?
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Old 04-01-2006, 12:19 PM   #5
2k2
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I used mobil 1 and had serious grinding issues. Switched to Redline Lightweight shockproof gear oil. Some people do a mixture but I am completely redline lightsweight shockproof.

http://www.racerpartswholesale.com/redline2a.htm

My shifting is much smoother and much less grinding than ever before.
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Old 04-01-2006, 12:19 PM   #6
incorporeal
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30,000


Ftw
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Old 04-01-2006, 12:21 PM   #7
alacrity024
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damnit.. i really wanted to get this done today.. not in the mood to go return five quarts of oil...
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Old 04-01-2006, 12:24 PM   #8
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Will you link me to the directions? and which pump did you buy and how much was it? I need to change my tranny's fluid too


FTW
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Old 04-01-2006, 12:26 PM   #9
awilson529
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Adam, I would'nt put the mobil 1 in your gear box. I did, and it was GREAT for maybe 1,000 miles, then the grinding got horrible (when I had a WRX). Even cruising down the street and shifting normally, any gear would grind. I have found the stock (valvoline) is the best.
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Old 04-01-2006, 12:26 PM   #10
2k2
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Quote:
Originally Posted by incorporeal
Will you link me to the directions? and which pump did you buy and how much was it? I need to change my tranny's fluid too


FTW
Pump?

Theres no pump needed to change the rear diff and 5mt fluid on a WRX. Just a long funnel to get the fluid into the spout for the MT.
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Old 04-01-2006, 12:26 PM   #11
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the pump was like three bucks at autozone.. it kinda looks like an oversized handsoap pump.. dunno how it works yet, but i remember changing fluid in the rear diff of my SVX it was a very awkward pour angle to put new fluid in it..

http://www.scoobymods.com/forums/sho...smission+fluid
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Old 04-01-2006, 12:26 PM   #12
Clarque
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I put in the mobil 1 75w90 in my sti tranny and rear diff. at 30,000 miles recently...soon after I noticed that my synchros were ****** up! so I brought the car to the dealer and am having them replaced...for free hopefully. I will not be using Mobil 1 again though. I am not happy with it at all. The fact that I had more problems with the tranny tells me that the stock stuff was working better than the Mobil 1. The damage was alays there, but the mobil one made it way more noticeable. Stick with the subaru stuff.

I normally swear by Mobil 1...but thats only for motor oil. which I also no longer use. I have been using Torco SR1 5w30...works great! I will never go back

-Ryan
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Old 04-01-2006, 12:27 PM   #13
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Quote:
Originally Posted by awilson529
Adam, I would'nt put the mobil 1 in your gear box. I did, and it was GREAT for maybe 1,000 miles, then the grinding got horrible (when I had a WRX). Even cruising down the street and shifting normally, any gear would grind. I have found the stock (valvoline) is the best.
grrrr.... okay well i'm going back to autozone after work
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Old 04-01-2006, 12:29 PM   #14
rex n effect
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I used a mixture that contained some mobil1 for my first change. I'm not sure what part of the mixture caused it, but I got grinding when it was COLD out. 30 k later, I switched to redline lightweight shockproof (the blue sticky stuff?) and no grinding this entire winter. Instead of grinding, it was just slower to get into gear when it was cold.

Transmission forum? Don't be afraid...
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Old 04-01-2006, 12:32 PM   #15
2k2
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Is this for a WRX or a RS?

WRX instructions:

1. Remove bolt from 5mt, it takes a 1/2 inch ratchet IIRC. Clean off bolt and magnet.
2. Replace bolt.
3. Get a long non stiff funnel and fill up 5mt.

Rear Diff
1. Remove lower bolt and drain, more will drain if you have you car with the front higher than the back
2. Replace Bolt
3. Again you need a long funnel and fill.

Thats it!

I still reccomend Redline Shockproof, you wont be able to get it at your local autoparts store though. It fixed all of my grinding problems.
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Old 04-01-2006, 01:28 PM   #16
Stanley
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My syncros took a crap on me about 10K after switching to synthetic. They were replaced under warranty, but I will never run synthetic in my Subaru transmission again.
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Old 04-01-2006, 01:33 PM   #17
incorporeal
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I done gots me a 4EAT impreza wagon


FTW
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Old 04-01-2006, 01:34 PM   #18
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oh.. so you can't change the fluid yourself.. you need to take it to a reputable shop with a transmission pump..
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Old 04-01-2006, 01:34 PM   #19
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should i just get the pennzoil "syncromesh" stuff or what??
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Old 04-01-2006, 01:38 PM   #20
incorporeal
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Quote:
Originally Posted by alacrity024
oh.. so you can't change the fluid yourself.. you need to take it to a reputable shop with a transmission pump..
yea but thats like $120 and I would rather do it myself


FTW
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Old 04-01-2006, 01:40 PM   #21
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yeah but you CAN'T do it yourself. the best you can do is drain about 1/4 of the fluid and replace it.. if you do that once a month, theoretically you'll have done a full fluid change in about four months time.. automatics will not fully drain by themselves, they need to be pumped.. if you have a transmission fluid pump at your disposal, then by all means do it yourself..
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Old 04-01-2006, 01:41 PM   #22
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DO NOT USE SYNTHETIC GEAR OIL IN YOUR CENTER DIFF. Your synchros need the friction so that you can shift properly. I learned this the hard way, I put all Neo Synthetic in mine, and it was grinding like crazy. I had to drain out a quart, and replace it with GM Synchromesh.

This is b/c the tranny shares oil with the front differential, IIRC. It's a catch 22, it needs lube for the bearings, but needs friction for the synchros. There's a bunch of threads about it in the tranny forum.
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Old 04-01-2006, 01:43 PM   #23
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Quote:
Originally Posted by dcmomentum
DO NOT USE SYNTHETIC GEAR OIL IN YOUR CENTER DIFF. Your synchros need the friction so that you can shift properly. I learned this the hard way, I put all Neo Synthetic in mine, and it was grinding like crazy. I had to drain out a quart, and replace it with GM Synchromesh.

This is b/c the tranny shares oil with the front differential, IIRC. It's a catch 22, it needs lube for the bearings, but needs friction for the synchros. There's a bunch of threads about it in the tranny forum.
*sigh*

i always like to put something "better" into my car whenever something needs to be replaced (aka brake pads, clutch, suspension components, fluids, etc) so i feel like i won't be accomplishing much by putting dino oil in the transmission..


but oh well.. it seems i must.
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Old 04-01-2006, 01:44 PM   #24
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and hey dcmo.. if i manage to sneak white powder into one of your clubs, you probably won't be there??? you're potentially bailing on the BBQ so i assume you'll likely not be out at the clubs if you're all snotty and oozy, right?
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Old 04-01-2006, 01:44 PM   #25
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Quote:
Originally Posted by alacrity024
*sigh*

i always like to put something "better" into my car whenever something needs to be replaced (aka brake pads, clutch, suspension components, fluids, etc) so i feel like i won't be accomplishing much by putting dino oil in the transmission..


but oh well.. it seems i must.
Yes, I fall under the same mindset. That NEO **** cost me like $18/quart of some outrageous price. But I was like, hey that's what the WRC team uses. :cries:
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