i was astonished at how a different filter made my tappy lifters quiet. some filters start the oil pump dry where its prime is lost... it takes a while to get sufficient pressure to REALLY lubricate the top end. with the fram filter my lifters were tappy especially when cold. anyway, what kinda filter you runnin? its simple: better oil pressure from better filters. i replaced the fram with ac delco hd222 , they can also try to sell you a P series filter , but the HD is heavy duty with high capacity i think the P is cheaper and may stand for passenger vehicle.
i guess they use this filter on some Allison Heavy Machinery. anyway it made a big difference in lifter noise for me. NEVER BUY FRAM..
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