Quote:
Originally Posted by menotakoala
15K miles per oil change? sounds too high. Shouldn't it be around 3000?
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For regular oil Toyota, for instance, recommends 5K and my independent import shop recommends 3K. For synthetic oil I would use 5K and the oil mfrs often say 10K. 15K seems extreme, especially for a fine new engine that also may be subjecting its oil to the heat of a turbocharger.
Synthetic oil holds up but gets dirty like any oil, with particles suspended and bonded to the detergent additives. I guess BMW has figured that the load in the oil does no harm up to 15K. But at 15K the oil will be pitch black, and I would not want it in there that long.
I have changed my oil at frequent intervals for the past 40 years, not wanting to trust or pay others to do it. Now I understand that the BMWs don't have a dipstick. So if a dealer or Jiffy Lube were to change the oil and over or under fill, or not change the oil at all, for that matter, there would be no way to tell.