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      09-13-2011, 11:13 PM   #1
N8dawg
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When to change air fliter

I recently had my first oil change and I assumed it would come with a change of an air filter. However the SA informed me that the CBS (Condition Based Service, key swiping mechanism) would tell him when to change it and it wasn't ready. I'm curious because an air filter doesn't seem like something our vehicles could electronically know when to change. Is my dealer accurate?
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      09-13-2011, 11:16 PM   #2
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idk about the electronics portion of the question, but cabin air filters should be changed around every 20k miles or so.

It's probably just a countdown, just like every other electronics mechanism...
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      09-13-2011, 11:55 PM   #3
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Quote:
Originally Posted by N8dawg View Post
I recently had my first oil change and I assumed it would come with a change of an air filter. However the SA informed me that the CBS (Condition Based Service, key swiping mechanism) would tell him when to change it and it wasn't ready. I'm curious because an air filter doesn't seem like something our vehicles could electronically know when to change. Is my dealer accurate?
When I asked the Dealer once on my other car (328i)
he mention that service will cover it every 30K miles or so unless if the car 'says' so
but he confessed to me 'if I could' I would change it every day..
suggesting me to pay for it...($150)??!

So I went on parts purchased wholesale for $26
and install my self every 15K....but I don't know the answer on the M3..
I will have to find out soon I guess
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      09-14-2011, 01:15 AM   #4
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I took a long trip in my 2011 E90 and picked up a bunch of bugs - I got a "service needed" message well before service was due, so I think the electronics sensed the problem when it became a problem.
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      09-14-2011, 02:59 PM   #5
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I'm replacing it every 2 years, which means 8K miles to me. When I replaced it recently, it was pretty dirty. Remember the airbox is open on our car, so all kinds of bugs and crap gets lodged in the filter. No way I'd wait until 30K miles. I'd at least clean it every 10K miles, and for sure replace it every 20K max.
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      09-14-2011, 04:02 PM   #6
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I got the same run around from my SA when I took my M3 in for its 15K oil change. However, read the manual and bring it with you. The manual specifically says to change the air filter when you change the oil. When I showed this to them they put a new air filter in.
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      09-18-2011, 09:50 PM   #7
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i have an oem filter i can give to u for free if you want. just pay for shipping. i changed to an oiled filter so i dont need the oem. its in good condition with very little mileage and its still very clean. pm me if you want it.
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      10-21-2011, 09:01 AM   #8
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i know that most dealers are cutting corners. even though they charge you for it, they dont change the filter. its the same with your break fuild and stuff like that.
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      10-21-2011, 11:35 AM   #9
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I change my own filter between around 15k miles, or every other oil change I do it. I change my oil and the filter every 7500 miles, and the second oil change I change the filter as well just to be safe. It might be a tad overkill, but I'd rather just have my mind at ease.
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