Just picked up my friends Super glide at a local shop. The shop changed his oil in the motor & tranny used Amsoil. He then asked me what I use in my Street Glide, I tell him Mobil 1 synth and Redline Shockproof in the tranny. He jumps and says man! that is the worst stuff you can put in your tranny. He says when you drain it for an oil change about 1 quart still stays in the tranny because its so thick, also keeping in there little fragments that should be on the drain plug. These little fragments left behind continue to move around in there through the gears and such. Whadya think?