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No, use exactly what Cummins recommends and nothing else.
best is 20w40 grade engine oil.
Use only what the manufacture recommends and nothing else.
Mixing oil weights is a NO,NO.
You can buy 20w40 oil. Mercursier, Yamalube, Amsoil, and other synthetic oils come in this weight. Or you could just use 10w40 if 20w40 is recommended.
I wouldn't go any heavier than 10W. The problem when you use an engine oil with that much higher a viscosity rating than the OEM recommendation is the main bearing in the engine - those tolerances are EXTREMELY tight, and too heavy of an engine oil will prevent that bearing from getting the lubrication it needs.
SAE 10w30 is better for lower temp and SAE 20w40 is the opposite better hotter temps.Thanks
They can range greatly from 5W30 to 10W30 to 20W40 to 20W50, depending on the application, engine type, driving conditions. Best to check OEM specs
3 litres, 0.79 US Gallons, 6.3 US Pints SAE 10W40, 10W50, 20W40, or 20W50
The weight of the oil and flow rate. The 5w30 will flow easier when cold than the 20w40. It is 5 weight oil when cold whereas the other is 20 weight when cold. When the oil reaches full operating temperature the 5w30 is 30 weight oil and the 20w40 is 40 weight.
20W40 or 10 W40 motor oil will do. Some use Yamalube, I just use Wal-mart stuff. The engine is almost indestructible.
20W40 with no friction modifiers is what is called out for my XJ600s