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May need a valve job or, the lifters might need adjusting.

I have heard that lifter noise is a common problem.

From day one I have put in slick 50 every 3 oil changes.

I put 5w-20w synthetic oil in every time. Also Lucas oil treatment, when I don't put in the slick 50. Runs quite as a baby. 362K and still going strong.

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Q: What causes the motor to knock constantly on a 1992 Mazda MPV when there is plenty of oil?
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