Hey folks, would like to find out what Delvac1 usually goes for pre qrt or gallen. I've found it for 10 bucks a gallon. Think they got the thing miss-priced. They got 8 gallons of the stuff, thinking about buying it all. One more thing- Would this oil be good for a 2000 LS1 Pontiac, 85 5.0 Mustang, and a 2001 Kia Rio? Would I be better off with 0W40 Mobil 1?