Quote:
Originally Posted by gmcer
time to change the oil in my 50' gmc 228 its original with 63,ooo miles a valve job runs sweet with some blow by . if you you guys got some suggestions on wieght or synthetic or non that would be great. thanks in advance!  |
As far as I know, you cannot use synthetic oil for the '47 - '66 generation engines. Someone correct me if I am wrong on that.
Napa sells an oil specifically designed for these engines. Not sure about the weight but that can be found out easily enough.