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Thanks for the replies. Wires, cap and rotor all look new. I have to pull the plugs out this weekend to have a looksie. I'm guessing they're fouled at a minimum.
As far as the the oil with zinc, I'm not entirely sure but folks on this forum seem to like Delvac and Rotella. My '90 300SE has the newer hardened cam and so doesn't need the zinc additive according to MBDOC, IIRC. So in other words, it's something I have yet to purchase, much less form an opinion on.
The slapping noise has me worried, let me tell you...
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-tp
1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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