4.3 Oil ?

[Chief123]

1986 4.3 Cobra
New long block
Ready to add oil and prime the engine.
Should I use the 30 or 40 weight or what?
I'm not much on synthetic oils or at least I've never used any.
TKS

 

[Howard Sterndrive]

sure, OMC called for 30 so that will certainly work
or 20W50, 25W40 also very similar weight oils to the 30.

 

[Chief123]

TKS,
Well doesn't matter now. The new long block they send did not have the adapter or whatever u call that the oil filter screws on. Tried to get old out of bad block but no luck. I have bought many short and long blocks and Never was it not on the new block. The more I deal with this new block the more I worry about being Had.
We Will see!

 

[HT32BSX115]

You should be able to get an oil filter mounting adapter from Summit and/or several different auto parts outlets.......Even Amazon can get them............

 

[jerryjerry05]

Use a breakin oil.
Royal Purple is an expensive one but the best!!
Contact them.
Amsoil is good too.
Even Coach Joe Gibbs makes/sells a breakin oil.