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Re: Lifter noise at cold start up
Was this an AC Delo PF47 oil filter? Try replacing the oil filter again but use a better quality one. WIX, Purolator, Mobil, K&N, Baldwin, etc. Sometimes when you get coolant contamination after UIM or LIM gasket issues you have to drain the oil again or more than once after the repair job. The residual coolant damages the cheap rubber anti-drainback valve in the AC Delco oil filter which is now made by Champion Labs for GM.
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