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Old 08-12-2019, 10:27 PM
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35d oil leak from filter housing

Ive noticed a steady leak coming from my oil filter housing. I use mahle filters but it dosent seem right to be leaking. It appears to be coming from the point of sealing when tightened close, i know this is common with n54 motors but have yet to see any info on the diesels
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Old 08-12-2019, 11:15 PM
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The large O ring is supposed to be in a grove in the cap that keeps it inside the housing. Bit it's pretty easy for the O ring to slip out of its grove and end up at the top of the threads between the housing and the cap.
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Old 08-13-2019, 09:25 AM
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The o-ring can be replaced every time the filter is changed as the filter comes with a new one. I use a tiny amount of fresh oil on the o-ring also.

Overtightening can crack the plastic lid. I think they have a torque spec but in both my M5 and the X5d, they just stop turning.
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Old 08-13-2019, 11:25 AM
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I always use the new ring provided with a dab of oil of the finger to lubricate the new ring, opened the filter early today and the ring was seated properly. Was tightened fairly tight nothing appears cracked on the cap. Still guessing, im going to wash the area and look for leaks closely
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