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I have a 2000 1.8T with less than 35k on the odometer and i just put in a drop-in K & N air filter.

I friend of mine told me that it might not be a good idea. He has heard of the oil that is on the filter building up on the map sensor which eventually leads to a $700 replacement job.

Has anybody heard of this actually happening? Could this actually be a problem?

Thanks for any input!
 

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i have heard this problem before. however, it seems in every case that it occurs after the filter is washed and then over-oiled.

i've had my K&N for 5 years so far, washed and re-oiled once a year and not a single problem.

so you just dont wanna over-oil it after you clean it. simple. :D
 

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Someone recently told me that oiled foam filters were the best compromise between air flow and particle filtration. Something about the oiled gauze filters (e.g. K&N) allowing a fair amount of dirt through, in an effort to improve air flow. Most purists still insist that the OEM fiber-type filters are best. I just wish there was an unbiased, honest source for these kind of answers.

I used a K&N direct-fit panel filter in my Taurus SHO for several years without any MAF problems (177,000 miles and counting). Although, it always seemed to me that I got better results with a cheap Fram filter in the winter. Maybe the cold temperature makes the oil too thick to breathe through?
 
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