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
15W40 Chevron Delo 400 or Shell Rotella
if it si 15w40 engine oil
Gas engine uses 10w30 Diesel uses 15w40