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).
I think the issue would fall back on why would you do it? I wouldn't do it as a habit but people mix viscosities every time they top off. You don't think 10W-30 is still 10W-30 after a few thousand miles do you?Lubrizol says said:"We invented most of the components used in today's motor oils and our components are compatible with the widest range of the world's base oils."