The old case backhoe calls for 30wt oil what’s every one using ? Should I stay with 30wt or switch to a 15-40wt or do they make a 15-30wt for the old equipment 1970 ish?
I personally use the newer 15W-40 in my older diesels and they run great. I still however run Sae 40 in my Detroit Diesel, but will soon be trying the newer Shell 15W-40 in that as well. There are a lot of companies making 10W-30 diesel oils, but only a few making 15W-30 diesel oils. I run 15W-40 year round and have had no issues.
A310, I prolly would not switch to the Rotella in your Detroit 2-stroke. It is well documented that the ring/port interference eats multi-grades and in turn, the liners and rings go away ...