Spark plugs fouled BADLY!!! HELP!!
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??
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
Monochromatic Paint (Custom Blue)
Flat Badged (front)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS