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I have heard the ongoing issues with the x5 cold weather start, Exploding Oil separator ( had this happen to my wife s bmwx5. Had it taken care of under warranty but its still an issue. I had a oil pan heater installed and it helped but if you travel over night or take it to work or go shopping its kind of hard to plug it in every where you go. Will never buy another BMW will only recommend to friends not to buy BMW products. Something tells me BMW doesn't care about the customer ( what a HUGE MISTAKE) I live in Maine and it can get in the -30F on occasion . The X5 doesn't like it when it gets around 10F. _ have an old GMC pickup that only cost me 18k when new, starts every time, bmw cost me almost 50k, not a very good value.
I have had the same problem couple of weeks ago. I drive a 2005 530i (has the M54 engine) and while on the highway driving @ 60 mph in a cold night, white smoke bilowed out of my exhaust. Other cars behind me alerted me by flashing their beams . I was able to stop safely and find out checking the dipstick that there was no oil left in the pan - all had gone thru the enigne and burnt thru the exhaust. The exhaust was dripping oil... I towed the car to the BMW service center. The dealership diagnosed the problem as a frozen oil separator that pulled the oil into the engine. They fixed the problem for ~$1300 but they cannot guaranty against any future engine or exhaust failures from that incident. It is disappointing that BMW knows about this issue for so many years and haven't informed customers to replace it before major damage happens. I contacted BMWNA and waiting to hear if they will reimburse me for this charge. I find it highly irresponsible for BMW to let people have such terrifying incidents while they know that the original oil separator in M54 engines will eventually fail at cold weather states. Unacceptable.
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