R
RonH
Guest
Walmart 10w40 Valvoline synthetic is about $7 a quart and works real good. I can't say any difference over conventional oil, but for the few bucks difference every 4,000 miles might as well use synthetic I figure. Of course a million different views on weight, but personally I would never use a 5w40 even if it acts like a 40w at high temp, and 15w40 marginal in cold weather, 20w50 too thick for cold weather.