actual there is a big report raul posted a while back that states the car filter actual has the best break down of sludge and what not compared to motorcycle and other leading car filters....i use the pure puraltor pure one filter the 3.5 i have had no problems at all i was worried at first using car oil in my shit but have had no problem what so ever....actual it quited my motor down....i wish i still had the survey that raul sent me.....it was really interesting and showed no difference between motorcycle oil and car oil...