Well today I got my AMSOIL membership so I can get AMSOIL at cost.

I am tring the GL-4 80w 90 tommarrow and if it sucks I'll go with RP. IF that don't work I guess I'll be calling John

 

is this what you are getting

if so all i can find is a GL-5. can you post a link to the GL-4 80w-90? and what are the advantages to the 75w-90?

 

In the U.S. there is use of mostly American refined lubricants in the Evo´s. In Europe and Britain however, the brands favored in the States are for the most part unknown and little used. Pennzoil, Amsoil, BG, Royal Purple...are all mystery oils on the other side of the Atlantic.

Over there they prefer Castrol, Duckhams, Miller´s(oil, not brews), Motul, Silkolene and other oil companies which we hardly hear of in America. Somehow, in spite of the fact that they don´t put Synchroshift, Synchromax, Synchromesh or whatever, in the trannies of their Evos...they somehow keep their gearboxes and engines from grenading.

I use Motul Gear 300 75W-90, 100% synthetic in the gearbox of my Evo RS. Stuff works for me.

 

Here you go evo150.

https://www.amsoil.com/storefront/agl.aspx

It says that...

AMSOIL Synthetic 80W-90 Gear Lube replaces all conventional 80W-90 gear oils and exceeds the lubrication and performance requirements of front and rear differentials, transfer cases, transaxles, manual transmissions, oil lubricated wheel bearings, and steering gear boxes that require any of the following specifications:

API GL-5 & MT-1
MIL-PRF-2105E
Dana SHAES 234 (Formerly Eaton PS-037) for 250,000 miles
MACK GO-J
Arvin/Meritor 0-76D plus hypoid gear oil specifications from all domestic and foreign manufacturers such as GM, Ford and Daimler Chrysler.
Can also be used rear axles where API Service GL-4 lubricant is recommended