W123

300D Leaking Valve Cover Gasket

I have completed a valve adjustment and replaced the valve cover gasket. After running the car, oil can be seem around the edge of the gasket where it meets the engine block. The bolts are tight and I donot understand why there is a leak. The gasket was obtained from a OEM operation. Should I get a gasket from the dealer? Have other people experience this problem?

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1982 300D Mild engine shake and smoke exhaust at initial startup

I am having a 'rough idle' issue I cannot seem to resolve; I will categorize as mild because I have worked on a two 240D (1980, 1981) and I was able to perform the recommended maintenance to have them idle very smoothly.
Additionally, hard initial start or it quits right after initial startup, then I am getting a blue smoke from the exhaust at the initial startup and for about 10 minutes before complete warmup.

Here is what I have done up to this point using the manuals, advice, and parts from mercedessource:

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'80 Wagon self leveling suspension question

Greetings,

I can hear some clunking with riding over bumps in the road. I read
Kent's SLS troubleshooting guide for some tips. All of the following
checked out: no leaks, fluid level good, pump working, sway bar links tight,
pulled an accumulator and seal good.

What isn't working is the manual operation of the leveling valve. I can
also see some cracks in the differential mount. The valve was replaced
1-2 yrs ago. I have a new mount, but stopped upon finding the valve was not
responding to manual operation. Any ideas/suggestion?

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