15w 40 engine oil can be used for all temperatures down to -15 deg centergrade !
A diesel engine would use 15w40 a gas engine could use 15w40 or 10w40
generally 15w40 or heavier
15w40 rotella
Gas engine, 10w30Diesel , 15w40Gas engine, 10w30Diesel , 15w40
The W stands for Winter. 15w40 is flows as 15 weight oil in the cold temperatures and 40 weight oil when it gets to full operating temperature.
castrol 15w40 CRD oil
-30
There should be no problem with mixing them.
15W40
5w20, 5w30, 15w40. It depends on the engine and operating conditions.5w20, 5w30, 15w40. It depends on the engine and operating conditions.
Gas Engine: 5w30 Diesel Engine: 15w40
-20F to +100F