Quote:
Originally Posted by tbracing
The main benefit with going with a K&N filter (or similar) is the $$$$ Let me break it down for the deet-da-deets, You spend ($20) on oem, and replace it every 30,000 miles. Depending on your environment (dirty,sandy,dusty) you might/should replace at 15,000, So how many oem filter changes will you do? K&N for my 2011 335i is $54. So you tell me why after my free maintenance is up, why would I continue to pay ($20) for a filter when K&N will last a lifetime for only $54! Look at 98% of off road race trucks (including mine), they use K&N and have never have problem with foreign material ingestion.
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Yeah, well maybe.
So the E9X calls for a filter change every third (BMW-schedule) oil change, so that's about every 45,000 - 50,000 miles. An OEM filter is $25 for a '06 325i from Tischer. A K&N filter is $50 from Turner Motorsport. So for the price of a K&N the average E90 owner can by two OEM filters and drive their car up to 150,000 miles (50K on the factory filter + 100,000 miles on the two replacements). I doubt many owners, even on this Forum, keep their cars past 150,000 (most think they blow up past the warranty period - LOL). K&N recommends cleaning the filter every 50,000 miles. The recharger kit costs $13. You may get 2 - 3 re-oilings with it, which is half the cost of a third OEM filter, which gets an owner to 200,000 miles (which hardly any one on the Forum will go with the same car). So I don't see any real savings. Throw in the chance of an owner over-oiling the filter when cleaning it and the possible damage to the intake sensors (and resultant repair) I see no real advantage to using one. And I say all of this from using K&N's since 1997 in five of my vehicles; all of which I converted back to paper.