The Stovebolt Site Forums The Shop Area Engine Shop Modern Oil in a Classic Engine

I use JD 15-40 in all of my older engines and all of the farm machinery.

I use the lighter weight oils only in the later model vehicles. I am actually using 5W-20 in my Neon. I would like to use it in my newer model v8 Chevrolet, but it is still under warranty and they recommend 5W-30. After the warranty is off, I think I will switch to the lighter oil.