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Air filter type vs Air flow sensor

Engine

Vehicle Information: Model: 911; Year: 1990; Body Type: Convertible; Engine (type, size, modifications): 3.6 L; Total Mileage: 54,600;

We recently purchased a 1990 911 C2 and I was considering getting a reusable air filter (ie: K&N type) rather than buying numerous paper air filters during the time that we own the car. However after talking with a long time Porsche owner I am reconsidering. It was his contention that as air passes through the oiled filter it picks up oil particles that get deposited in the air flow sensor and/or on the intake air temp sensor. This causes erronious voltage signals (input) to the DME control module which inturn causes a rough running engine due to improper fuel/air mixture, soon followed by an expensive repair bill. I have read in there advertising that these aftermarket air filters claim to increase performance by 5-8 hp. But being a bit of a skeptic I figure that this hp is measured at the flywheel and not back at the rear wheels where the increase is is probably negligable. I was, however, hoping to save a few dollars over the years but one fouled air flow sensor or intake air temp sensor would more than erase any savings I might have gained by using a reusable air filter as opposed to a paper filter that would be replaced every two years or so. Have you ever heard of an oiled air filter fouling an air flow sensor or an intake air temp sensor? Also what is your opinion of reusable air filters versus one time use air filters.

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