Recomended oil weight?
 

My wife and I just purchased a '83 944 (with the engine out of an '84), the car has approximately 115k miles on it, while the engine has approx 90k. Apparently the owner before the guy I bought it from didn't follow directions for flushing the cooling system and blew the engine, so it was replaced with a used engine from an '84. The original engine came with the car as well.

Anyway, I was wondering what people are running for oil weight, the owners manual seems to suggest 10w-40 or 15w-40 for my area ( heading into fall/winter, we get temperatures from 40s-80s Fahrenheit) I was going to start it off with Mobil Synthetic blend but can only find it in 10w-30 around here.

This is not my first classic/older car, but it is my first German car (I don't count my 2008 Super Bee, even though it has a lot of German in it LOL).

Thanks!!

RE: Recomended oil weight?
 

20w-50 castrol, or 15w-50 mobil 1 synthetic.

RE: Recomended oil weight?
 

Thanks Doc!

RE: Recomended oil weight?
 

I would recommend a full synthetic 5W-50 oil. This will give you better cold flow on startup while still providing full 50 weight viscosity at operating temperature.

RE: Recomended oil weight?
 

I think an engine blowing up from not flushing the radiator is a pretty big load... my 951 has NEVER been flushed with 280k on the clock, other things suck but not the engine. Still running solid compression across the board.

-Beefey