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2011 GL 320 CDI, 2004 E320, 2000 C230, 2004 Toyota Sienna
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231 Posts
Discussion Starter #1
What plugs should I get for 1990 300E 3 liter, for emission test ? Also what should be the gap.
 

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2011 GL 320 CDI, 2004 E320, 2000 C230, 2004 Toyota Sienna
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231 Posts
Discussion Starter #3 (Edited)
Thanks sammywater, but his shipping to Ontario is $21.75. I may as well buy locally.
Also what is the gapping on F8DC4 plugs for 1990 300E
Regards.
 

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1992 300ce, 3.0, 207,00 mi.
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335 Posts
As discussed before, F8DC4's are not the correct application for a 103 engine, they require a taper seat plug. F8DC4's are a regular gasket type plug that serve well in a 104 engine.
 

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1992 300ce, 3.0, 207,00 mi.
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335 Posts
They are different, the 103 uses a non-gasket taper seat plug, whereas the 104 uses a regular gasketed type plug. If you use a F8DC4 in a 103 it will work but the plug won't extend fully leaving a couple of threads of the spark plug hole exposed to the hot combustion gases and will quickly carbon up. You will find that the gasket becomes very distorted fm trying to seal against a tapered seat. When you eventually try to install the correct plug you'll have problems seating it fully because the last few threads will be fouled w/ carbon.
 
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