Anybody using Driven brand HR-2 oil in their slant?

cruiser said

Guys/Gals: My engine builder swears that this is the only oil to use in my newly rebuilt slant six in my 1974 Duster.

Click to expand...

I think if there’s even a remote possibility of a warranty consideration somewhere in the future, you've answered your own question right out of the gate, Bob.

Now, after the engine has fully broken-in and is no longer covered by the rebuilders warranty…..

And NAPA oil used to be Ashland (Valvoline) back when I managed the Savage and Egan stores (early 90’s). May still be the case, but I no longer know for certain.