When I didn't know any better I ran Chevron supreme 10-40 in my 1996 Dodge ram 1500 5.9 gas engine lifted 4x4 PU. I changed the oil and filter every 3 or 4 thousand miles . when I sold it it had 278000 miles and ran perfect . the guy that bought it now has switched to Dello 400 15-40 and it has 302000 miles on it now . he just passed emissions lat month ,and it still runs great . just imagine how many miles you could get with synthetic .
