I use a variety of Bel-Ray products; chain lube, foam air filter oil, 2-stroke oil, 4-stroke oil, fork fluid, 2-stroke transmission oil---that's all I can think of right now. I think they have a solid line of products, with few negatives. I've emailed them several times about different 4-stroke oils and never got a straight answer about their base stock, group, additive composition, nothing, they ain't talkin. I've had good results with all of their products and I continue to turn to Bel-Ray often for my atv lube needs.
Chris