Just switched Trans & Diff to Amsoil Synthetic

tripod · 10-06-2006, 01:46 PM

And couldn't be happier. I have used Amsoil synthetics in my race vehicles for years. Back when I had the RX7 in the early 80's, I changed the trans & diff to Amsoil, and picked up 8 mpg in the winter. Now that I have 7,500 on the STI, and winter is coming, I thought I'd do the changeover.

The Shifting is so much smoother it can't be believed. All the notchiness is gone, shifts with 2 fingers. I also know that the synthetic deals with heat much better than regular gear lube, and the syn poor to 60 f below zero.

Best investment I have made in the car.
http://www.amsoil.com/storefront/svg.aspx

LightWerkz · 10-06-2006, 02:27 PM

Thats strange, honestly I didnt notice anything and I was planning on it

I used Redline.

***MKIVSupra*** · 10-06-2006, 03:19 PM

I am glad you like it SO FAR. Everyone loves synthetic oil in the trans when they first put it in, I even noticed a positive difference when I put fresh dino oil in my trans, but let us know how it is 5k+ miles later. Problems usually come up after a while with synthetic in the trans, not within the first couple hundred miles.

tripod · 10-06-2006, 04:28 PM

Quote:

Originally Posted by MKIVSupra

I am glad you like it SO FAR. Everyone loves synthetic oil in the trans when they first put it in, I even noticed a positive difference when I put fresh dino oil in my trans, but let us know how it is 5k+ miles later. Problems usually come up after a while with synthetic in the trans, not within the first couple hundred miles.

Problems? What problems? I have used Amsoil in various transmissions and differentials for over 20 years. I have never had a problem.

krees23 · 10-06-2006, 06:17 PM

I've had Synthetic in the engine at the 1K mile mark and in the diffs / tranny at the 30K mile mark. So far no problems. I just switched from Redline to Amsoil 2K miles ago at the 60K mark for everything and the tranny seems to shift alot smoother.

STIdrivr · 10-07-2006, 06:58 PM

So you put in that severe gear that is in the link? How often are you supposed to change the tranny fluid on a 04 STI?

***MKIVSupra*** · 10-07-2006, 07:02 PM

Quote:

Originally Posted by tripod

Problems? What problems? I have used Amsoil in various transmissions and differentials for over 20 years. I have never had a problem.

With Subaru trans some people experienced hard shifting, grinding, syncro issues, etc. with various synthetics in their trans after they put a few k miles on. I have not looked lately, but when I was thinking of doing my trans fluid change I did a lot of research on nasioc and other subaru forums, and read enough to where I just stuck with valvoline dino gear oil. Maybe you won't have issues and I hope you don't cause I like Amsoil motor oil and would not mind trying their gear oil, but for now I am sticking with Valvoline dino gear oil. Keep us posted on how things go.

krees23 · 10-07-2006, 08:49 PM

Quote:

Originally Posted by STIdrivr

So you put in that severe gear that is in the link? How often are you supposed to change the tranny fluid on a 04 STI?

I'd have to look in my owners manual for the exact mileage to do the changes, but I do it every 30K miles.

***520*** · 10-07-2006, 09:17 PM

Quote:

Originally Posted by LightWerkz

Thats strange, honestly I didnt notice anything and I was planning on it

I used Redline.

i heard redline is one of the worst that people have used.

**Majin** · 10-07-2006, 09:41 PM

Quote:

Originally Posted by tripod

And couldn't be happier. I have used Amsoil synthetics in my race vehicles for years. Back when I had the RX7 in the early 80's, I changed the trans & diff to Amsoil, and picked up 8 mpg in the winter. Now that I have 7,500 on the STI, and winter is coming, I thought I'd do the changeover.

The Shifting is so much smoother it can't be believed. All the notchiness is gone, shifts with 2 fingers. I also know that the synthetic deals with heat much better than regular gear lube, and the syn poor to 60 f below zero.

Best investment I have made in the car.
http://www.amsoil.com/storefront/svg.aspx

funny that you posted this two days ago, but i just took my car out for a drive after changing the tranny/front diff and rear diff fluids as well to Amsoil 75W-90 severe gear - it's still early to give full impressions, but i agree with your analysis. Amsoil is by far, in my opinion, the best synth fluid.

LONEWOLF · 10-07-2006, 09:52 PM

Quote:

Originally Posted by 520hpSTi

i heard redline is one of the worst that people have used.

Does anyone known if Royal Purple work fine for transmission and diferentials? Or it is as bad as Red Line.

jawwadh · 10-07-2006, 10:17 PM

how many quarts do we need for the trans and diff?

**Majin** · 10-07-2006, 10:28 PM

Quote:

Originally Posted by jawwadh

how many quarts do we need for the trans and diff?

get 6 quarts - it'll use close to 5.5 quarts.

0bluesti4 · 10-08-2006, 12:01 AM

Quote:

Originally Posted by 520hpSTi

i heard redline is one of the worst that people have used.

hmmm...thats strange because COBB highly recommends redline MT-90: "Great balance of friction and lubrication. This is a good choice for a street/auto-x car. Highly Recommended."

Here's the link:
http://www.cobbtuning.com/tech/gearoil/index.html

krees23 · 10-08-2006, 07:52 AM

I tried Redline and I tried Amsoil - Amsoil FTW

10-06-2006, 01:46 PM	#1
tripod STI Driver Car: '06 WRX STi CGM Location: Libertyville, IL Posts: 258 IWSTI Addict since: Jun 2006 Trader Rating: (1)	Just switched Trans & Diff to Amsoil Synthetic And couldn't be happier. I have used Amsoil synthetics in my race vehicles for years. Back when I had the RX7 in the early 80's, I changed the trans & diff to Amsoil, and picked up 8 mpg in the winter. Now that I have 7,500 on the STI, and winter is coming, I thought I'd do the changeover. The Shifting is so much smoother it can't be believed. All the notchiness is gone, shifts with 2 fingers. I also know that the synthetic deals with heat much better than regular gear lube, and the syn poor to 60 f below zero. Best investment I have made in the car. http://www.amsoil.com/storefront/svg.aspx This ad is not endorsed by this member. Please register or login to hide this ad.

10-08-2006, 07:52 AM	#15
krees23 Senior STI Driver Car: 2005 Subaru STi Fav Mod: Cobb Swaybars and Kartboy Endlinks Location: Minnesota Posts: 351 IWSTI Addict since: Oct 2005 Trader Rating: (1)	I tried Redline and I tried Amsoil - Amsoil FTW This ad is not endorsed by this member. Please register or login to hide this ad.

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10-06-2006, 02:27 PM	#2
LightWerkz STI Master Car: E46 M3 Fav Mod: ZCP Wheels Location: Clifton Posts: 7,473 IWSTI Addict since: Aug 2005 Trader Rating: (78)	Thats strange, honestly I didnt notice anything and I was planning on it I used Redline.

10-06-2006, 03:19 PM	#3
*MKIVSupra* Moderator Elite Car: 04 Subaru WRX STi, W Fav Mod: KartBoy SS & Bushings Location: Illinois Posts: 8,746 IWSTI Addict since: Jan 2001 Trader Rating: (0)	I am glad you like it SO FAR. Everyone loves synthetic oil in the trans when they first put it in, I even noticed a positive difference when I put fresh dino oil in my trans, but let us know how it is 5k+ miles later. Problems usually come up after a while with synthetic in the trans, not within the first couple hundred miles.

10-06-2006, 06:17 PM	#5
krees23 Senior STI Driver Car: 2005 Subaru STi Fav Mod: Cobb Swaybars and Kartboy Endlinks Location: Minnesota Posts: 351 IWSTI Addict since: Oct 2005 Trader Rating: (1)	I've had Synthetic in the engine at the 1K mile mark and in the diffs / tranny at the 30K mile mark. So far no problems. I just switched from Redline to Amsoil 2K miles ago at the 60K mark for everything and the tranny seems to shift alot smoother.

10-07-2006, 06:58 PM	#6
STIdrivr Junior STI Driver Car: Black 04 WRX STi Fav Mod: Coming Soon Posts: 84 IWSTI Addict since: Aug 2005 Trader Rating: (0)	So you put in that severe gear that is in the link? How often are you supposed to change the tranny fluid on a 04 STI?

10-07-2006, 10:17 PM	#12
jawwadh Grassroots STI Racer Car: 04 wrb sti Fav Mod: AP st2 Location: oak lawn, il Posts: 525 IWSTI Addict since: Dec 2005 Trader Rating: (1)	how many quarts do we need for the trans and diff?