Quote:
Originally Posted by ponytuning
Has your driving style changed since the last oil change? Driving more in sport mode or more aggressively?
I didn't get this message on either of our 50Is (x5 and x6), but they're definitely burning oil, the idrive read between max and full before I changed oil a few days ago in my wife's 2015 x5 50i after 7000 miles of driving since the last oil change at the dealer.
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The TU's are still going to eventually suffer the same fate as the N63 as you get closer to 100k miles. Valve stem seal replacement is the only fix. BMW was bit off on their tunning on the first gen, with the N63 needing it by 60-70k. The N63TU will need it by 100-120k. Driving style (city vs highways) Greatly affects this.
The high temps the N63TU runs at, along with the heat & sound protection, reflecting and trapping heat in the valve covers, and being a hot vee design, creates a perfect storm of cooking the hell out of the seals, causing premature heat oxidation and failure long before they normally would.
They improved it on the TU but just enough to last past warranty periods.