Quote:
Originally Posted by mayno
change your oil every 3K miles is so 80's and only applies to conventional oil.
5K miles...so you're basically saying that premium synth oil is only 1.6x better than conventional dino oil. I would say that it's at least 3X better which would be 9K miles.
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The durability of the oil and what it collects are 2 different things. 100% pure synthetic oil can be used for 50,000 miles if sucked out of yoru engine and put threw high pressure filter to remove the debris.
It's not all about the "break-down" of the oil, but removing what the oil picks up from your engine.
Your first 2 oil changes are the most criticle. 2,ooo & 5,ooo and then every 7k after that is a good rule of thumb. You can do it yourself for about $50 bucks and let BMW do their gig around 14,ooo miles.