Quote:
Originally Posted by bmwbob89
Keep your head up and ignore the peanut gallery! I usually run spark plugs for 100k. I would wait until it causes a running problem. Then you have to see if it will come out. Who knows when that will be. Motor on!
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I swap out plugs at ~100k miles on every other car I've owned. On my N54 a set of Bosch plugs haven't lasted much over 30k miles even with just a mild OTS tune. Brand new plugs were toast within 5k miles after the latest upgrades. Car is running amazing right now after switching to NGK. We'll see how long they last but 100k miles is a pipe dream for a N54 from my experience.