What Oils Can I Use In a 4.3 Mercruiser?

[maczilla23]

Hello, I was wondering if there was an alternative oil I could use rather then the Mercury Oil. I cant find it locally so I have to order it online and it gets crazy expensive doing that. Any help would be appreciated!

 

[tpenfield]

Are we talking engine oil or outdrive Oil? More flexibility in the engine oil IMO.

 

[maczilla23]

Im talking about the engine oil sorry.

 

[maczilla23]

I actually need to do the outdrive too so ill take advice on that as well!

 

[Starcraft5834]

Well mac...last fall I put 20-40 in my 3.0..been out 3 times..decided to change it..to quicksilver 4 stroke 10-30 Marine engine oil... my 1987 3.0 takes 10-30...The marine engine oil will likely hold up better..as for drive oil..90wt will do..go to walmart and get it in marine section

 

[dubs283]

mercruiser recommends 25w-40 in all their sterndrive engines, next best is sae 30

i only recommend using mercury/quiclsilver high performance gear lube in all mercury/mercruiser drive systems