OK, thanks for the info. I wonder why it's only API S (passenger car) but called HD on front label. Traveller makes a non detergent SAE 40 Oil that they call 'Standard' which I know wouldn't be good to use.
Was hoping the HD would make it OK.
Big shame not to be able to put this oil in the...
Picked up awesome Dynahoe 4x4 Loader/Backhoe, has 453 Detroit Diesel, early eighties, late seventies.
It seems the best oil out there for it is the Delo 100 straight 40 weight (nice low sulfated ash), but I happened to find SAE 40 HD oil at the local Tractor Supply and was wondering thoughts on...