What type XXw oil to use in Hercules engines.

[GMCPic]

Any one have a recommendation as to what type, brand and weight to use??? 1947 Oliver HG-42 w/Hercules IXK3 engine.

I was thinking of Quaker State 30W Non-Detergent.

I used the NAPA 1105 oil filter.

[Blake Malkamaki]

I like to use 15W-40 in just about everything. 10W-30 would probably work. Single weight oil would be fine, but you'll probably have to change to lighter oil if you live where it gets cold in the winter. I would not use non-detergent oil.

Blake