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Old 01-02-2001, 05:34 PM
300E Russ
Posts: n/a
We have a 92 300E sporting Bosch F 9 DCO plugs gapped @ 0.032 in. Can I safely replace those with Bosch Platinum HR 9 DPX plugs? I was told they are a hotter plug. Will the hotter plug burn the piston top or am I off base with that notion? When I pulled the old plugs to inspect them, the F 9 DCO's were gapped at .050 in. and thought there must be something wrong. I've never seen such a large gap on any plug. I regapped them at .032. Right, wrong? What can the result be if the gap is way off? Consume oil? Misfire? Run rich, lean?

Thanks in advance for your input.

Russ 300E
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