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At this point, I am going along with the misplacement of the O-ring. Great German engineering. I see no reason why they made it as complicated as they did, when they could have included a simple spin-on type filter arrangement, such as is found on every American car on which I have changed the oil: the rubber gasket is at the top of the filter, instead of at the bottom, where it is easy to be misplaced.
I understand that a spin-on adaptor is available, and I may well decide to make the change-over at the next oil change.
Smitty
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