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View Full Version : What is the right weight oil for a new flathead engine?



GeorgeColvin
07-14-2012, 03:52 PM
I would like to know what the right weight oil to use to break in a new flatehead 6?

31Streetrod
07-14-2012, 04:07 PM
For your location and time of year the ideal break in oil would be 30W--non detergent.

Corvanti
07-14-2012, 04:17 PM
For your location and time of year the ideal break in oil would be 30W--non detergent.

yep!!! 30 W non-det was the only oil ever used in my '40. no oil filter, so it was changed at every 1,500 miles or 3 months. :)