Just bought a new Chrysler minivan with 4 banger (last one went 190K on Jiffylube, still purring). My wife drives it 1 MILE to work. Some city/highway miles. Figured to stick to the 3,000 OCI (maybe 4K). Will also use 5w30(preferred) winter/10w30 summer according to manual. Will save $ doing changes myself. Will the quality differences in these three oils warrant spending more (will try to keep this baby to 200K if I can keep it from getting crunched, might keep the wife of 27 yrs. also!). I'm eally interested in the Schaeffers and looking for a better 5w30 (less viscosity breakdown) oil. Use Pennzoil now. Please share your expertise. Except not you knuckleheads - you know who you are. Have a great weekend.