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Bought my car used, first oil change found out the rear drain plug had the threads stripped out. I used a heli coil to repair damage threads in pan. Installed new Bmw drain plug and crush washer. It's been 6 oil changes later and it's all still holding up well. FYI... When installing a heli coil, If it is not installed correctly it will leak oil. it has to be perfectly straight in order for the crush washer to be 100% functional and seal.
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