Oil for MD2B

Feb 19, 2023
102
Dufour Dufour 34 Clipper Yacht Harbor
Hi All,

Happy Holidays.
I have a Volvo MD2B which is from 1975.
I have a manual.

The Manual says.
Above 20C - SAE20
Below 20C - SAE10W W for Winter
20C is 68F.


What do you recommend putting here ?
I had one mechanic put SAE30.
The other one put 5-40W.

Engine smokes slight white.


Thank you