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.