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Same thing happened to me last week. Brought my '11 x5 to get Valve cover gasket and OFHG changed and when they went out for a test drive they said the motor stopped and wouldn't start/the starter will no turn over the engine. They then towed it to the shop and removed the oil filter and there were metal filings in the oil (to me it didn't seem like a lot, but I'm not sure) they then opened my old oil filter and there were filings in that one also (seemed to be less filings than in the new one). They are saying that there two possibilities for this failure.
1. At some point my car ran low on oil.
2. There was some sort of carbon build up on the springs inside the valve cover and when the oil change was done the detergent washed it loose and this "carbon" clogged an oil port somewhere.
I should mention that I had just purchased the vehicle on
Dec 06 2018 and I only ran less than 6000km(3500 miles). So as far as whether proper oil changes were done in the past I do not know.
The shop/ mechanics claim no responsibility.
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