So if you didn't already know, the new X4 has a dry sump system and has the typical oil reservoir. Those of you new to dry sump, you don't check it like a wet sump system where you can check your oil level cold. You must warm up the motor, then shut it off, and then check it. I was stuck in 'wet sump' mode and checked it cold and it was about halfway up the checkered mark area on the dipstick, so naturally I added some oil.
Now depending on the system, you can or cannot overfill, for instance, GM says to not overfill the Corvette's dry sump reservoir. On the X4 you have 3 lines going to it. One at the bottom, which obviously feeds the pump, a hose at the top, which I assume is for vapor/emissions, and a 3rd tube, which I assume is the oil return. The dipstick is 7" long and the oil return is 3" from the top of the reservoir. Theoretically I'm thinking one could overfill so long as you don't fill past the return line but I'm sure there's the possibility that the crankcase could be overfilled as a result. Thoughts?
Now depending on the system, you can or cannot overfill, for instance, GM says to not overfill the Corvette's dry sump reservoir. On the X4 you have 3 lines going to it. One at the bottom, which obviously feeds the pump, a hose at the top, which I assume is for vapor/emissions, and a 3rd tube, which I assume is the oil return. The dipstick is 7" long and the oil return is 3" from the top of the reservoir. Theoretically I'm thinking one could overfill so long as you don't fill past the return line but I'm sure there's the possibility that the crankcase could be overfilled as a result. Thoughts?
