Join Date: Nov 2000
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Re: Fram filter question
The article on the filters is interesting. I can understand that a poorly designed leakback valve in the filter could result in the unpriming of the system and some initial lifter noise due to a lack of initial flow, but that should quickly go away after a moment of running, just as it does after changing filters.
Have you changed the type of oil you used? I found that when I had a faulty lifter, thicker oils actually made it worse (contrary to the claims on the bottle of additive). Also, it's possible that if you used a detergent agent to flush your system, it may have stirred up some solids that are now blocking a passage.