yea i was at walmart too this weekend and saw that the rotella syn. was 12 bucks or so.. i have heard good things about it.. not real sure how good it is. i like the rotella.. back home(west texas) everyone uses delo. because heck all of us worked for chevron. i know thats a good oil too. but im partial to rotella. anyway! has anyone tried the syn? how did they like it?? i talked to my friend yesterday he runs the rotella t with the amsoil by-pass system 01 ctd.. and loves it .. he changes his oil every 10k miles.. and he says its really clean. just seems like a long time on oil. just my .02 cents.