I put in 1 quart of Redline Synthetic MTL and 1.75 quarts of Redline Synthetic MT90. This works so much better in this transmission then the Royal Purple MaxGear 75W90!!!! It shifted realy notchy before and now it is as smoth as a hot knife in a bucket of butter! Now my transmission is spec.'ed for GL4/GL5 75W90 so any GL4/GL5 product will protect just fine. The difference though is in shift feel!!! It is also very quite.