Hello Board, I have a 1987 300E, I pulled the spark plugs today and # 1,2,3,6 were covered with a hard crusty build up. I think have 2 problems:

1. My car is running rich, It could be "carbon bulid up"??. I've posted this a few times,.

2. My car's oil is too thin(I live in Miami,FL and I run 10w-30) and is leaking past my valve stem seals. I think that I will have to switch to 20w-50. I noticed a little oil on the threads of the spark plugs.


What could that hard crusty build up on my spark plugs be??


Oil or running rich OR BOTH??

HELP!!

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1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
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