Quote:
Originally Posted by jmfurgason
Great forum, much needed info,any one know if Castrol GTX 10w30 conventional has adequate ZINC ? this oil was highly recommended, however this is my 1st change 1963 GMC 305E 1000
|
probably not. If you use this or any other modern oil, you will have to add a zddp zinc additive with every oil change. Lucas oil company has a great one.