Originally Posted by Nishan
Thanks guys. I also called a BMW dealer and the service manager told me that it will not cause problems.
I am just going to leave it until the next oil change.
And yes....lesson has been learnt!!! Next time I will
before I do anything on the car
Like someone mentioned, I would change the oil out earlier than BMW's suggested interval. The factory TWS motor oil is high a quality group 4/5 synthetic. Adding just a liter of mineral won't harm your engine but it will degrade the oil inside your engine quicker. The viscosity of the oil added was thinner at operating temp plus group 1 and 2 mineral oils won't last 10,000 miles. Mineral oils should be changed out within 3,000 miles to avoid sludge build ups.