Well this is a good thread to ponder in. As always a very educational oil thread with the help of gray racer. My question is about the additive/stabilizer Lucas produces. Has anyone used it in a off road motorcycle, more particularly the yz 450. I use the stuff in my vehicles, simply because the first time I used a quart of it in my '65 Chevy with the original 283 v8, I noticed less valve train clatter/lifter noise, I also noticed higher sustained oil pressure by about 15 - 20 lbs, throughout the full tempature range of the oil. By full tempature range, I mean Arizona summer heat, freeway cruising at 3k rpm. As I was changing the oil in my truck last weekend I was reading the bottle, and it stated it was acceptable to use in a wet clutch motorcycle application, up to 20%.