Some Mobil M1-303A oil filters are shipping without gaskets - Page 2 - Chevy and GMC Duramax Diesel Forum
L5P TSB (service bulletins, recalls, updates) Postings of Tech Service info for any New L5P engine issues.

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post #11 of 13 (permalink) Old 10-04-2018, 12:13 PM
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I think it's a much thicker gasket vs other brands, and the tighten specs on it differ too. Perhaps the extra weight has something to do with it being loose?

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post #12 of 13 (permalink) Old 10-18-2018, 08:30 PM
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Changed oil/filter today, 10,532 miles.
Unscrewing the M1-303a, I had a 1st. As I was slowly backing it off, with a bit of upward pressure to release the oil spill in the pan, that ring gasket came off and dropped down, hanging on just the center threads.

It's always either stayed on the filter, or on the mount. Never has it dropped down and hung like that.

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post #13 of 13 (permalink) Old 02-24-2019, 05:08 PM
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I've got two Mobil M1 303A's if anyone wants them for nothing, but to pay for shipping to you. I switched over to a dual bypass system and had bought them but don't need them. Send me a PM and we can figure it out.

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