[AT] Diesel rated oi/ Gasoline powered engine?

[Cecil Bearden]

If I was concerned about Rotella, I would pour in a bottle of Zinc 
Dithiophosphate it is recommended for flat tappet engines. Personally I 
use Mystic 15W-50 in all my later model engines.  The old Detroit 3-53 
in the compressor uses Mystic 40W with Lucas Oil added.    Most of the 
older engines don't run hot enough to get the viscosity modifiers to 
activate.  Those need straight weight.   Any flat tappett engine that is 
used hard I use the zinc additive.

Cecil

On 5/26/2019 8:58 AM, Henry Miller wrote:
> I should have Google first, looks like this oil doesn't have a s rating. I'd not run the tractor until I asked shell. Probably it is good enough, but they don't claim any rating and I'd want an oil chemist to comment before trying anything. If you need to use the tractor drain the oil and put in a sf rated diesel oil. Save the drain oil for your diesel engines (you do have one?)
>