Hey Welcome! What year are you driving? Because Different years require different viscosity. I am not an engineer however Why would you want to mix viscosities?tehaurai said:hello guys,
I need to add like 1/4 of mobil1 5W-50 to the oil already in the engine (mobil1 15W-50)? do you see a problem in mixing different oil numbers. (both are 100% synthetic).