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The cheapest "fix" is to change the oil, use 20-50 mineral oil rather than
10/15-40 semi-synthetic viscosity.
That may work, if not then you could try an engine flush but this is a risk, older engines have a layer of oil which has "semi-bonded" to the metal and the flush loosens it at the risk of leaving particles free in the system which can then block up vital oilways.
Replacing the lifters is the best and most expensive solution.
Mike.
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