Amsoil MTF WOW (new)

[Sammy Sandbag]

2kredz3,

What MT oil does Amsoil make that would be the equivalent to Redline MT-90? I've been running Redline in my other car, a supercharged MR2 with a helical (no clutch packs) LSD. I mention the LSD because it's a transaxle, so the differential shares its lubrication with the transmission. I've been so impressed with the Amsoil in my M Coupe (5w30 Syncromesh) that I wanted to switch the Spyder as well. It's making about 300hp and 200ftlb (vs 190hp and 150ftlb stock.) Your recommendation?

Thanks!

[325bob]

Yes, you will like the thicker 75w90. Make sure it is the mtf 75w90 not the gear oil.

Why?, is a synchro. additive in it? aren't gears all gears?

[BenH]

I am a convert too. It took about 200 miles of break-in to feel the improved smoothness.

[rf900rkw]

Why?, is a synchro. additive in it? aren't gears all gears?

In a word, NO.

Gear lube has many variations. The stuff you buy in the stores now days is GL-5, which has a lot of high pressure additives making it suitable for use in hypoid gear drives. Many transmissions specificly ban use of GL-5 due to those additives.

[325bob]

In a word, NO.

Gear lube has many variations. The stuff you buy in the stores now days is GL-5, which has a lot of high pressure additives making it suitable for use in hypoid gear drives. Many transmissions specificly ban use of GL-5 due to those additives.

I never got why, the same load is on the tranny gears, only they are much smaller, you'd think they need the extra protection more. Thicker,I would understand, but the original post had identical weights.

[rf900rkw]

With normal gears, such as in a transmission, the gear teeth never move across each other. The come into contact, and they come out. But there is no movement at the contact point. This is not so with hypoid gears. They wipe across the contact surface as they move. It takes a much stronger lubricant to deal with this load. GL-5 has additives to deal with it. These additives are often corrosive to some metals.

[2kredz3]

Gl-5 is harmful to yellow metals specifically. Such as brass and copper, which is what synchros are made from. There are gl-5 fluid designed not to harm yellow metals (amsoil 75w90 manual transmission and transaxle lube) but these fluids are not suitable for use in rear differentuals.

Basically it just depends on the aditive package, the weights of oil are only to reference performance @ various temps.

[Joemamaman]

I've been an avid Amsoil user for almost 10 yrs now... in my bikes, pwc's, boats, and family's cars I maintain... good stuff!. Their P.I. is amazing too.

Anyway, my question is this... My '97 Z3 1.9 manual tranny has label saying to use ATF. When I first bought my car, it shifted terribly, but after changing all the bushings realated to the shift links, new clutch (and everything associated with it)... last was Amsoil ATF. It took a few hundred miles, but it did improve... not 100%. Maybe 90% better, which is still amazing. So... can I use Amsoil MTF 5w-30 instead of ATF for my manual tranny?

Thanks!

[2kredz3]

Yes i would change to the MTF I did testing with all the transmission products from amsoil and a few other companies in the z3's and mz3's and the MTF is the most compliant for all driving conditions. the atf is just a hair too thin.

[IgotBMW]

What Amsoil do you recommend for my diff. I have a 1.9L 4 cylinder. Mainly DD not taken on tracks.

Just replaced my tranny with Amsoil Synthetic ATF this weekend has seen improvements on shifting.

Thanks

[2kredz3]

do you know if you have an open diff?

[wrench13]

Amsoil - waitin fer warmer weather to change my manual tranny fluid out, but my bike, 1.6L Roadstar, has seen Amsoil Synth since 600 miles and 60,000 miles later has yet to have issue one with the transmission or any other lubricated part. Bikes are particularly hard on oils especially those that share oil with transmission, wet clutch and engine body ( like mine). Bike gets changed out every 4K, even tho with synth you can go longer. On doing a clutch plate change this year the inside of the engine looks brandy new.

[IgotBMW]

do you know if you have an open diff?

I don't, but I'll check.

[2kredz3]

without lsd = 75w90
with lsd = 75w110

[dkindig]

without lsd = 75w90
with lsd = 75w110

Kelly,

Need some clarification on gear oil weights before I open this Amsoil 75w110. I was looking through the TIS and found what, at first blush, looks like discrepancies with your recommendations and I wanted to get your feedback.

The TIS states that non-limited-slip diffs get SAF-XO oil (old spec 75w90) and limited-slip diffs get SAF-XJ (75w140). I can see how you would spec 75w110 in place of 75w90 due to the change in API guidelines. But, it seems that SAF-XJ is indicated for my car ('01 3.0i) and 75w140 would be the one to go with.

Is the 75w110 recommendation because of the Torsen diff as opposed to a multi-plate lsd? Just want to be sure before I crack these bottles open...

[2kredz3]

Personal experience has led me to recommend 75w110 over 75w90 in the 6cyl non m z3's. 75w90 is fine for the 4cyl cars (without lsd). I have found the 75w110 runs smoother in the torsion units then 75w90 and offers lower diff temps after spirited driving. I hope that helps :-)

Kelly,

Need some clarification on gear oil weights before I open this Amsoil 75w110. I was looking through the TIS and found what, at first blush, looks like discrepancies with your recommendations and I wanted to get your feedback.

The TIS states that non-limited-slip diffs get SAF-XO oil (old spec 75w90) and limited-slip diffs get SAF-XJ (75w140). I can see how you would spec 75w110 in place of 75w90 due to the change in API guidelines. But, it seems that SAF-XJ is indicated for my car ('01 3.0i) and 75w140 would be the one to go with.

Is the 75w110 recommendation because of the Torsen diff as opposed to a multi-plate lsd? Just want to be sure before I crack these bottles open...

[Bergen Bimmer]

Whats up everyone, I'm glad I caught this thread because I've been having cold shifting extreme stiffness in my trans with mobil one 75-90 and searched the forums for a thread like this with no luck. Thanks for all this great info you guys have posted, it has helped me alot and I'll be switching to Amsoil asap. I've never experienced a cold shift problem before with the American cars I've had before this Z. Its just a viscosity issue and before reading this post I did not know there was a 5-30 weight trans fluid in existence so thanks for educating me.

[dkindig]

Personal experience has led me to recommend 75w110 over 75w90 in the 6cyl non m z3's. 75w90 is fine for the 4cyl cars (without lsd). I have found the 75w110 runs smoother in the torsion units then 75w90 and offers lower diff temps after spirited driving. I hope that helps :-)

Okay. After reviewing the TIS more carefully, I see that the 75w140 (SAF-XJ) recommendation is for multi-plate limited-slip differentials (which ARE in the M) and that the Torsen units do not fit that description. So it looks like 75w90 was the original spec for the Torsen units and the 75w110 is the way to go to hit the high end of the OLD API viscosity range for 75w90...

Thanks, Kelly!

[Z3speed4me]

I have to get some of this stuff in the spring / summer for sure based on how much everyone seems to be loving it. Prob grab some dif fluid too if you have it for the eventual 2.93 swap.

[aquirolando]

Plus one on Amsoil Severe Gear, for Diffs! Great for running hard. I will be picking this up as well. MTF

[dkindig]

Spent the day changing out tranny fluid to MTF, diff fluid to Severe Gear 75w110, flushing the brakes, flushing the power steering, then went out for a test drive...

WOW!

I could tell the difference in transmission noise coming down the hill from my house (30% grade that I ride second gear down). The tranny shifting is silky-smooth and the characteristic whine that I had from the diff under no-load conditions from 55-65 mph is almost completely gone!

The passenger compartment is much quieter now and I can hear the engine like never before. I am very impressed! Thanks Kelly!

[2kredz3]

I have to get some of this stuff in the spring / summer for sure based on how much everyone seems to be loving it. Prob grab some dif fluid too if you have it for the eventual 2.93 swap.

I keep tons in stock of all flavors, and if you happen to be close to one of the amsoil distribution centers then i can drop ship from there as well :-) just let me know when your ready. I am offering 10% off all orders right now

Spent the day changing out tranny fluid to MTF, diff fluid to Severe Gear 75w110, flushing the brakes, flushing the power steering, then went out for a test drive...

WOW!

I could tell the difference in transmission noise coming down the hill from my house (30% grade that I ride second gear down). The tranny shifting is silky-smooth and the characteristic whine that I had from the diff under no-load conditions from 55-65 mph is almost completely gone!

The passenger compartment is much quieter now and I can hear the engine like never before. I am very impressed! Thanks Kelly!

:-) I have brake fluid and the correct fluid for the power steering system as well maybe next time. It was a pleasure doing business with you, I hope that the shipping time was acceptable

2kredz3,

What MT oil does Amsoil make that would be the equivalent to Redline MT-90? I've been running Redline in my other car, a supercharged MR2 with a helical (no clutch packs) LSD. I mention the LSD because it's a transaxle, so the differential shares its lubrication with the transmission. I've been so impressed with the Amsoil in my M Coupe (5w30 Syncromesh) that I wanted to switch the Spyder as well. It's making about 300hp and 200ftlb (vs 190hp and 150ftlb stock.) Your recommendation?

Thanks!

sorry i missed this :-( the 75w90 manual transmission and transaxle lube is what you want :-)

[Bergen Bimmer]

Switched from 75-90 Mobil one to Amsoil light viscosity ATF this morning and in my 5 mile test drive noticed an improvement to the warm shifting(I had warmed up the trans on a quick ride before dropping the fluid). Will see how it does tomorrow morning after sitting in freezing temps all night and post my feelings on that. Thanks again 2kredZ3 I think you saved my trans, I only hope I can return the favor somehow. One more thing, I know you recommend the synchro mesh 5-30 for my application which was not available at my local Napa store so I got what I could get because it needed the change asap, so have you tried the light viscosity or know much about it in these transmissions?

[2kredz3]

Switched from 75-90 Mobil one to Amsoil light viscosity ATF this morning and in my 5 mile test drive noticed an improvement to the warm shifting(I had warmed up the trans on a quick ride before dropping the fluid). Will see how it does tomorrow morning after sitting in freezing temps all night and post my feelings on that. Thanks again 2kredZ3 I think you saved my trans, I only hope I can return the favor somehow. One more thing, I know you recommend the synchro mesh 5-30 for my application which was not available at my local Napa store so I got what I could get because it needed the change asap, so have you tried the light viscosity or know much about it in these transmissions?

The multivehicle atf is too thin for these transmissions...so the light viscosity is even thinner. It will be okay until it gets about 60 degrees out then you will start getting notchy shifts.

[IgotBMW]

do you know if you have an open diff?

Ok found out that my 4cylinder uses SAF-XO (75w-90) for Open Diffs.

So which Amsoil should I use for my diff?