Has 55,000 miles. I've used American Castrol Syntec 5W-30&10W-30.Also, Valvoline Synpower 5/30&10/30, and Mobil One 5/30.I went with the Castrol and Valvoline lately, because they are less expensive. I've been thinking about 0-30 weights,Rotella 5W-40, or perhaps Penz. Platinum all group 3or4 "synthetic" oils. I want excellent cold flow as it gets minus 20 degrees F here in Minnesota.I also want an oil that is locally available at Wally World.All opinions welcome. THANKS.