you can go 60,000 miles with Bosch Super plugs,100,000 with iridium plugs.
But plain copper gives the fastest 1/4 mile times.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

If I am not mistaken, P0300 is Random cylinder misfire. P0301 is Cylinder 1 misfire. P0300 can be caused by the P0301 so find out what is wrong with cyl #1 first. Probably a coil.

Paul

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84 500 SEL (307,xxx miles)