[Purdy Swoft]

I've used straight STP and didn't like it, as a matter of fact, I had a hell of a time trying to get it out . I've also used 140 and 90 weight. For me, its not always about using super thick gear oil to slow down the gears. Sometimes you can slow them down too much and you still get clash. Its more about equalizing gear and wheel speed. Its a feel that must be learned. I can glide through the gears clash free with 90 weigh gear oil just fine . Idle speed also factors in It can idle too fast or too slow and play hell with smooth gear shifts. Practice, gear oil and tuning all play a part. Just my thoughts and what has worked for me .