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My daily driver is a '94 Ford Ranger with 230,000 miles. The last time I bought an air filter for it was in 1995 when I replaced the paper element with a K&N. I did have to replace the MAF back in '99 but I suspect that was just the MAF going bad and had nothing to do with the K&N.
My '79 928 has a K&N, it was on the car when I bought the car earlier this year. It will stay on the car. The 928 air filters aren't cheap, so having this one component be reusable makes common sense. Although I will say most 928's don't get driven in conditions that truly warrant an air filter change as often as most owners probably perform them.
Has there actually been a known case where a brand new out of the box K&N ruined an MAF, or have all the failures been after the first air filter washing? If someone over-oils their K&N and it ruins the MAF, can't really blame the K&N.
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