i only have experience with maxlife. it does an excellent job of cleaning. i wasnt losing any oil before, so i cant speak for its "stop leak" additives. i will say though that RIGHT after i put the maxlife in my MPGs went down 2-3miles. someone people say they've had this problem with maxlife, some people say thers no way any motor oil could make that big of a difference. i guess ill know for sure after the next change when i replace it with Durablend.