A while back there was worry about synthetic oils and wet dish clutches. I just bought a Honda Rancher and I need to change the oil in it soon. I have plenty of M1 10W-30 and would like to use that in it, assuming it won't ruin the clutch. I have been using the old formula 15W50 M1 in my dirt bikes and street bikes without issue but it was made before the friction modifiers were being used. A lot of folks were using Rotella T synthetic at the time but last I looked they want as much for 2 quarts of that as a whole 5 qt jug of M1.
Perry
Perry