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Originally Posted by 84W123DT
I've just switched (200 km. ago, for the first time) to the Duron and I've had this problem before so I don't think it is the source (fingers crossed).
I will replace the valve cover gasket next valve adjustment and see.
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Just a thought, but I found that the valve cover had distorted on my 300cd after years of torquing down the hold-down bolts, compromising the seal with the head. I took a little metal off at a couple of the mounting tabs and the seal got much better.
Russ M.