Use anti seize when you reinstall the plugs. Why people do not is beyond me.

The upper timing cover is not too hard to change, just somewhat of a pain. Check the three and four way vacuum connectors, those become brittle with age and create issues.

Fresh oil does help with numbers, sounds silly I know. Something to do with blowby and whatnot.



Failing Nox can be too lean (think of your vacuum leaks...). HC is unburned fuel usually. Post the numbers if you can please.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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