Hi All,
My 505" is overdue for an oil change.
I recently bought a 5 gallon drum of Delo 400 for my diesel pick-up, and recall that some years ago, there was a lot of support for running diesel oil (Rotella, Delo etc) in engines with solid lifters due to a higher zinc content... if I remember correctly that is.

So, what's the current view on running 'diesel' oils in these engines?

(even though Delo is now sold as a 'mixed fleet' oil).

Cheers!