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Message: <blockquote data-quote="Lee12609" data-source="post: 735984" data-attributes="member: 12415">if you are running an oiled filter MAF cleaning should be part of your routine maintenance, not just on a mustang, on ANY car with an oiled filter and MAF. just because EVERY person doesnt know this doesnt mean its incorrect.most people wont notice when their maf is somewhat oily causing a 5% discrepency, its really only when the idle gets skewed that most people notice. a dirty maf is basically equal to an old o2, both send incorrect readings to the PCM causing incorrect a/f.... when the o2 is bad the PCM doesnt know the voltage its getting is wrong so it cant compensate, when the MAF reading is skewed the PCM will still change fuel trim to keep a stoich mixture EXCEPT AT WOT.....my point is oil does get on the MAF and can skew the readings which can possibly cause slight issues, but cleaning it is not the "fix all" that most people think, and post in EVERY thread.... "my car is barely running, misfiriring horribly" response "clean the MAF"......i have always cleaned my MAF every other oil change (6000 miles), and clean the filter, and re-oiled every 4 oil changes (12000 miles)..... just make sure you dont over oil the filter and you will likely never have a noticeable issue.</blockquote>