Do a search on the Mitsubishi forum here for +bosch and you'll see what I mean. I can't speak for their performance in other makes/models, but those Bosch 4-points are da debil for Mitsu 2.6 engines. I used them once in the past before I knew about them, and swapped them back out for NGKs after only a few months. IIRC, they tend to get carbon build-up, obscuring the gaps (despite having four of them).

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Stay the Trail!