You can think what you like, I know what I saw. I could actually see the oil leaking out from behind the harmonic resonator after I added mobile one. At the time I thought I was in serious trouble as that wasn't something that could be fixed cheaply. Although I haven't looked, but I believe there is no longer a leak after I topped up several times with castrol. Last top up was about 4 months ago. End of oil consumption suggests that. A taletell sign of a leak is the burning oil smell. I no longer have that.
My own theory is that the mobile one oil has the wrong molecule size for BMW engines. It would leak where castrol would not.
My own theory is that the mobile one oil has the wrong molecule size for BMW engines. It would leak where castrol would not.