99 HSE Bosch 158K - Lifters seem to leak down in about 3-4 Hours after running. They rattle bad for 2-3 seconds and then very quite. What's the best way to clean & what oil wt. would be best? Have added 1 qu. of ATF last oil change to help clean but did not do anything.
Hydraulic Lifter Rattle
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How many miles did you allow the ATF run? If things are gummed up it takes at least a few hundred miles to work.
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It may take a couple rounds if things are really gummed up. As ATF is just low weight super high detergent oil it is okay to run a quart in your engine at all times. Another option is off the shelf engine flush.
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