That stuff is like magic potion in my engine! Car`s sooooooo smooth and quiet accelerating you can`t even hear the engine. Z32 engines love the thicker oils,especially here in south Texas. 10W30 oil made it run as it it were "tired" in the 103+ summer days once the car was good and hot. The 15W50 is completely un-phased by heat. Silent cold weather startups,cooler engine bay,and smooooooooth as silk power!