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      01-15-2013, 01:00 PM   #59
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Drives: e92 M3 DCT
Join Date: Apr 2008
Location: S.CAL

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Originally Posted by Nishan View Post
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.

Current: E92 M3 DCT, Cayenne Turbo S, Ferrari F430 F1
Past:911 Turbo (996), C32 AMG, S2000, (E36) M3, Supra TT, MR2 Turbo