Don't hear much about Valvoline on the site. I've been using the stuff in the white bottle for years now in all my vehicles with no problems, including my 99 Z28 drag car, my 90 Jeep Wrangler, my 94 F250, and my wife's 95 Miata. All 10W40, bought by the case. No jugs! The drag car gets the oil changed about every time I take it to the track, and the others get 3000 miles or 6 months, whichever comes first. No way I'd go any longer or use "synthetic" which I think is a rip off. Also I use Fram and STP filters and I have never had any problems. I notice Fram gets bashed a bunch on here....