Hi everyone. I've searched prior to posting with no luck, just confused. I have two older GM V8 powered engine cars.
1975 Pontiac GrandVille, 455
1980 Cadillac CDV. 368
I'm lost as to what spec oil I NEED. These cars sit in an unheated garage in NC, mild climate. I used the QS 10w-30 with added zinc levels in the 455 this spring. Is this appropriate? What change intervals would be recommended(I change in the spring yearly now)? Thanks for your time. SL.
1975 Pontiac GrandVille, 455
1980 Cadillac CDV. 368
I'm lost as to what spec oil I NEED. These cars sit in an unheated garage in NC, mild climate. I used the QS 10w-30 with added zinc levels in the 455 this spring. Is this appropriate? What change intervals would be recommended(I change in the spring yearly now)? Thanks for your time. SL.