BMW wants to change the engine air filter every 30,000 miles. They will change the CABIN interior air filters every 20,000 miles. Seems to me that they have their priorities backwards. On the other hand, a new engine air filter, PN 13718518111 retails for $68.75. A new set of cabin air filters, PN 64119248294 (in bound air) and 64319194098 (recirc air) retails for $118.79, and $31.83, respectively. So they went with the more expensive option.
On our car, I pulled the filter and it was quite dirty with very small particles. Based on this, and on how easy it is to change, I plan to change it every 15,000 miles from here on out. The air filer on the US 3.0 D motor is under the engine cover at the rear of the engine near the oil dipstick. To remove it, you un-clamp 2 metal spring clamps, and you are out.
In my research, and based on how the OE filter is marked, a Mahle filter part number LX 2796/1 would be a good replacement for the OE one, probably for less cost.
Engine Air Filter, OEM BMW 13718518111, $68.75r
Total investment in vehicle to date = $4802.28
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| Engine Air filter is located here. Release the silver metal clamp shown, and the one on the opposite side to remove and replace the filter. |
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| 20K on the left, new on the right. |
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| 20K filter. Basically black with soot and dirt. |
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| New |
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| 20K filter on the left, new on the right. Doesn't look too dirty in this pic. |
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