Originally Posted by oldschoolfreak

well i used castrol 5w-30 full synth.. and it was like water!! so i talked to a friend that ownes a lube cube and he said the 5w stuff is strickly recommended by gm for emissions reasons and would recommend 10w-30 full synth instead so i think i will use it on the next change!! he has been using it in cavaliers cobalts etc for more than 10 yrs and never had a problem yet!! just my opinoin!! and thanx all for the input!!!! The Freak