Topic: Re: Re-addressing the oil dipstick NAA|
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There was a diaphragm between block & filter with a hole positioned toward the top. This prevented drain back to the pump below the level of the hole. However, other than the tight clearance/oil film at bearings, there was nothing to prevent drain back through the center outlet of filter.....this should take a very long, nearly infinite period of time in a non-worn out engine & even then get you down to a half full filter. The FORD spin on adapter has a similar hole at the top. As for the anit-drain back flapper valve incorporated in spin on filters, in my observation those are not much of a valve! Some seem a little better than others, but I would not expect any of them, even 'original' Motorcraft to hold for much time.
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