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Old 12-29-2007, 08:27 PM   #1
Big-E
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Default AMSOIL Gear Oil

Anyone use AMSOIL regular non-LSD gear oil? Do you like it?

I found a store nearby that sells the oil. Since I have a WRX I need only the regular non-LSD GL-5 oil for both the transmission and rear-end.

I have the Valvoline Super-Syn GL-5 in both w/o any problems, however the transmission tends to "grab" when switching gears into 2nd and 3rd on occasion, and really very little when fully warm, but it's still there every now and again. The Valvoline has the friction modifiers in it.

Thanks.
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Old 12-29-2007, 08:51 PM   #2
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I too have been thinking about switching, it is getting to be that time again to change the tranny and diff fluids. I read Amsoil's internal Gear Oil Test (a long one, decent data), and their Severe Gear 75w-90 GL-5 seems to be pretty stout stuff, and is non-corrosive. I was surprised to see several other brands that I have used (Mobil 1, Royal Purple Max Gear) not fare so well, especially in a standard corrosion test. I currently use Motul Gear300 and MotylGear, which were not tested, but my source of their product is not one that I would like to support any more.

Amsoil also makes a GL-4 synchromesh-specific gearbox oil that also has EP/Extreme Pressure additives that might be attractive, I might do a "cocktail" of 1 qt Severe Gear and the rest the GL-4 synchromesh to cure my own shifting issues that have appeared, and put a quart of the Severe Gear in the diff just to round things out.

Granted, I have 200K miles on my car and it is autocrossed heavily, but I do live in a warm climate that rarely sees temps below 40-ish when the car is run.

Give it a try and let me know how it feels, I want to do the same. Amsoil seems to stand behind their products and not cheap out like some other manufacturers (I say if you have a good product and it costs you X dollars to make it and Y dollars to sell it and stay in business, then go ahead and raise the price if necessary...if you have a good product) to save a few pennies and keep cost low. If the gearbox/diff have long drains anyway, an extra $2-$3/qt over 60K miles is not a deal breaker!
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Old 12-29-2007, 09:16 PM   #3
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Around here it's usually big brand names (e.g. Mobil-1; Castrol; etc.) or store brand (e.g. CarQuest; etc.) so if I wanted to get AMSOIL or Redline I would have to order it.

I found this store and they carry the AMSOIL products and say that they can also get Redline.

I changed the engine oil using the AMSOIL and I'm doing this every 3mos/2k miles because I basically don't drive the car and the oil ends up with the gasoline smell.

The gear oil and trans oil I changed at 3k miles and now have 12k miles. I think that if they're open this Monday and weather permitting, I'm going to make the change and see if it gets rid of the "grab" between gears -- it's very mild/minor, but does get aggrevating every now and again.

I had a 1990 Mustang LX-SC (5.0) that I had for 11-years. I changed the oil & filter (non-synthetic) every 2k miles, the trans fluid and gear oil annually, the coolant w/thermostat, p/s fluid and brake fluid every 2-years and had basically zero problems; and sold it 2001 w/o any oil burning, etc. This was a good car, but I'm no longer a Ford fan due to 2001 Focus and lousy build quality by FoMoCo. So I'm a Subie doobie fan.

So I'm a big proponent of changing fluids earlier and more frequently. I look at it as insurance instead of big $$$ spent later on.
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Old 12-30-2007, 08:15 AM   #4
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Just go to walmart and get supertech semi synthetic 75w90 gear oil in the gray bottles. It has no friction for limited slip use as per the bottle, and is rated GL-5. Best fluid I've ever used, and I have used redline... in other cars. Made by this company. http://www.wd-wpp.com/specsheet/75w90.pdf The wally bottle states excellent protection for yellow metals.
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Old 12-30-2007, 01:40 PM   #5
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I just switched to Amsoil Long Life. I didn't go with the Severe Gear because it has friction modifiers.

My only complaint is that it doesn't shift as well in the cold as the Specialty Formulations MTL-R that I was using. Of course, it's still better than conventional gear oil and it's better when warmed up. The SF was made from Group IV and V base stocks and I believe the Amsoil is Group IV. RL is Group V. Unfortunately the SF is no longer made. In 10 years of driving manual Subes with synthetic gear oils, the SF was my favorite.

Read this bitog thread for Amsoil rear diff recommendations.

-Dennis

Last edited by bluesubie; 12-30-2007 at 01:49 PM.
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Old 12-30-2007, 03:28 PM   #6
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Thanks for the input.

Mikey, unfortunately I don't go to Wally World.

Dennis, thanks for the link. Unfortunately they talk about blending only for the rear differential.

The vendor up the street sells only the SVG 75w-90 which I put into my Focus. So far it has smoothed out the gears except for 2nd so it's hard to tell if it's any better than the Motorcraft XT-M5-QS. I have to take the Focus out for a good ride instead of local stop-and-go, short distance driving, to see if there's going to be any real difference.

Right now I'm keeping the Valvoline Super-Syn oil in the Subie because it does work. When I put it in I also added a full tube of the Lube Control gear additive to each the gear box and the rear differential. As I had said above, I have some grab on occasion. Really though I have had this same effect on numerous manual shift cars that I've either owned or driven. As for the rear differential, I've had no problems to note.

I've gone back and read the specs of Amsoil, Valvoline, etc., and IMO there are too many variables. I don't race or rally the car, it's a DD so for me I believe that what's in there is good enough, and will be serviced again at a later date/mileage.

So thanks again.

Happy Motoring.

Last edited by Big-E; 01-02-2008 at 08:24 AM. Reason: content / new information
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Old 12-31-2007, 09:08 AM   #7
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nevermind
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Old 12-31-2007, 12:48 PM   #8
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Quote:
Originally Posted by bluesubie View Post
nevermind
I feel the same way, bluesubie...
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Old 12-31-2007, 12:55 PM   #9
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AMSOIL is amazing stuff... can't go wrong with it
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Old 12-31-2007, 01:26 PM   #10
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i just put in the amsoil severe gear 75w-90 in my tranny and rear diff. it's a little easier to get it into first, but other than that, not really any noticeable difference over what was in there before. but it's only been about 45 miles into the amsoil.
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Old 01-03-2008, 10:45 PM   #11
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Quote:
Originally Posted by Chino Bling View Post
i just put in the amsoil severe gear 75w-90 in my tranny and rear diff. it's a little easier to get it into first, but other than that, not really any noticeable difference over what was in there before. but it's only been about 45 miles into the amsoil.
Same thing here. I made the change in my tranny and rear diff about 15,000 miles ago and have not really noticed a difference.
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Old 01-04-2008, 08:41 AM   #12
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I just put in Amsoil Severe Gear as well... I was replacing the Valvoline conventional 75w-90 because I thought the shift action was degraded from OEM with the Valvoline.

Not much improvement with the Amsoil, if any... maybe a *bit* better shifting, but it still feels notchy going into gears.

BTW - I shift very gently on the street... sometimes I get honked at from behind because I take so much time shifting from 1st to 2nd pulling away from a stoplight.

I just met up with a local buddy with the same car as me... FWIW, he put in RL Heavyweight Shockproof and said it works spectacularly. I drove his car, and he's right. That goes against everything I've read on the boards... but the result was good, and it's been in there for 5k+ miles.
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Old 01-04-2008, 11:12 AM   #13
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You Amsoil SVG users should be careful in the summer if you are "quick shifters". That's when some people have problems with grinding due to the friction modifiers.

RL Heavy Shockproof is like using 75W250.
http://www.redlineoil.com/whitePaper/11.pdf

-Dennis
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Old 01-04-2008, 01:38 PM   #14
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bluesubie:

I've never had any issues w/ Amsoil & quick shifting. Furthermore, in my opinion, whatever lube you use ... if you try to shift quickly ... you eventually ruin you synchros in Subaru's.

Regards,
~Button
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Old 01-09-2008, 01:39 AM   #15
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Quote:
Originally Posted by bluesubie View Post
You Amsoil SVG users should be careful in the summer if you are "quick shifters". That's when some people have problems with grinding due to the friction modifiers.

RL Heavy Shockproof is like using 75W250.
http://www.redlineoil.com/whitePaper/11.pdf

-Dennis
You and bulwnkl are certainly Amsoil dealers.
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Old 01-09-2008, 01:45 AM   #16
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Quote:
Originally Posted by Chino Bling View Post
i just put in the amsoil severe gear 75w-90 in my tranny and rear diff. it's a little easier to get it into first, but other than that, not really any noticeable difference over what was in there before. but it's only been about 45 miles into the amsoil.
Boy!!!!!! That Amsoil sure works so much better than the rest! Well worth the extra cash Next time, I'll try that snake oil. I hear that stuff works good too. Perception is everything.
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Old 01-09-2008, 02:17 AM   #17
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"A Study Of Automotive Gear Lubes", good airplane/airport reading

http://www.amsoil.com/lit/g2457.pdf

We were tired of blowing up ring & pinions in Porsche 944 racing transaxles, lots of guys were using Mobil 1 75w-90, another brand that I am blanking on (EDIT-- Swepco 80w-90), and Royal Purple MaxGear 75w-90. Switched to LubroMoly Synthetic 75w-90 and it seems to have done the trick, haven't seen a failure in several years with those running the LM, and this is a field of 50-70 cars nationwide in the 944Spec class.

I have always used Motul Gear300 and Motylgear in my Subaru but my source is no longer in business, and our US-source of LubroMoly is drying up, and it prompted me to read the Amsoil literature after stopping by a fairly cheeseball booth at SEMA. Our cost on the LM was only $9, the Amsoil is about $12....again, a couple of bucks to keep from sharding R&P's is no big deal, as long as it works.

Methinks we will be running the Severe Gear 75w-110. Snake oil or not, we'll find out if we start blowing up transmissions again
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Old 01-09-2008, 10:40 AM   #18
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Quote:
Originally Posted by jetskibucky View Post
You and bulwnkl are certainly Amsoil dealers.
Please make at least a tiny effort to be less of a shill for your organization on the boards here unless you become a sponsor. I am not nor have I ever been an Amsoil dealer. I have tried their product and no longer use it. I have found it to be a good product in a general way, but overpriced for its performance in my applications.
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Old 01-09-2008, 12:55 PM   #19
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Quote:
Originally Posted by jetskibucky View Post
You and bulwnkl are certainly Amsoil dealers.
Wrong. I use Castrol Syntec in my engine and have used Amsoil's gear oils a couple of times. Let me know when Mobile [sic] brings one of their good 5W30's to the U.S.

Dennis
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Old 01-09-2008, 01:25 PM   #20
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Easy, children. Let's play nice.
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Old 01-18-2008, 07:25 PM   #21
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Update--

My buddy just bought a very nice '01 2.5RS sedan with 78K miles here in SoCal, we changed the fuel filter, rear brake pads, bled brakes and clutch, and changed the diff and gearbox.

Some nasty stuff glugged out of the diff, in went the Amsoil Severe Gear 75w-110. Not much on the magnet, though. The front diff/gearbox was a whole different story. Muddy crap came out, with a full 1/4" on the magnet-- no chunks/shards, but bad nonetheless. We put in 1.25 qt Amsoil Severe Gear 75w-110 and the remainder the Amsoil 75w-90 Manual Transmission Gear oil...I know it is a GL-4, but it was recommended on BobIsTheOiGuy to try out with mixing with the Severe Gear for shiftability.

He's got a 60 mile drive home tonight, we'll see how it stacks up. If it works out, I'll do the same on my autocross car.
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Old 01-19-2008, 11:05 AM   #22
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You and bulwnkl are certainly Amsoil dealers.
i'm a dealer for amsoil.
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Old 01-19-2008, 01:24 PM   #23
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Quote:
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i'm a dealer for amsoil.
Then everything you say is tainted and you will eventually be banned for not paying for Advertising on NASIOC
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