all napa oil is made by valvoline. however it is not of the same composition. it is still good stuff the difference being napa will MEET the standards of cj-4 where premium blue will EXCEED the standars.. also napa gold filters are wix premium filters fwiw.
A diesel engine would use 15w40 a gas engine could use 15w40 or 10w40
Gas engine, 10w30Diesel , 15w40Gas engine, 10w30Diesel , 15w40
Gas Engine: 5w30 Diesel Engine: 15w40
2006 duramax 6.6l diesel 10 litres 15w40 engine oil.
Not recommended because diesel oils have different Additives.
Gas engine 10w30 Diesel engine 15w40
engine: 12 quarts 15w40engine: 12 quarts 15w40
15w40 so says the manual
Gas 10w30 Diesel 15w40
if it si 15w40 engine oil
5w30 or 10w30 for a gas engine, 15w40 for a diesel
15W40 Chevron Delo 400 or Shell Rotella