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Originally Posted by bostondiesel
So am I understanding correctly that by adjusting the valve lash (which I had done about 4,000 miles ago) this will quiet the noise? Do lifters ever need replacing?
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If the noise is being caused by incorrect tappet clearance, then yes, resetting it should quiet the noise. Solid lifters rarely go bad, but when they do, they tend to take the camshaft with them. If you ever have to replace the camshaft, do all the lifters as well, since the cam and lifters wear together and using old lifters with a new cam can significantly reduce the life of the new cam.
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On the oil subject, should I stay with what I have been using, the Mobil Delvac, non-syn?
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At the risk of starting another oil thread, I will recommend a 5w40 diesel-rated synthetic for your climate (Connecticut-right?). What you're using is ok, but the synthetic will make cranking and starting in cold weather a little easier.