Yeah, it's really easy. Look under the hood on the driver side,
next to the radiator. There are several clips which hold down the
top, you simply pop them loose, remove the top, take the filter
out, then drop the new one in. You may have to use a little muscle,
but none the less, it's a fairly easy operation. As far as filter types,
K & N is OK, but it is my belief that if you change your filter every
6000 miles, you should be allright. Most air restriction
is at the air intake tube and throttle body, so it is a matter of how
often you change your filter that counts. Bigger pores in the filter
means more dirt into the combustion chamber, at
least that's my opinion.
Unless your not going to change your filter for another 100,000 miles stick to the original BMW paper type, a clean paper element is the sensible choice.
Don't believe any rumors regarding the K&N, or similar, air filters. They are performance filters, comprised of materials that breath more efficiently and STILL restrict the passage of particulates into the air stream. I have yet to talk to one person who noted a K&N air filter wrecked their engine. I, personally, have switched to the K&N over the stock for my bimmer and noticed a slight improvement in the way the engine sounds/performs. Note though, that K&N filters still require cleaning once a year.
If you're looking for the cabin air filter to your A/C system, check in the rear of the engine compartment, just below the windshield. I've also heard some of these cabin air filters can be located behind the glove compartment in the passenger cabin.
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