Engine air filter: Is this piece important?

VAB5 · 03-27-2021, 10:35 AM

I ordered a Mann C28125 engine air filter from Amazon, which matches the part number of the BMW air filter I pulled out except for a /1. The replacement is missing the fuzzy white material pictured below. It was glued to the BMW air filter.

Looking closer on Amazon, there's a C28125/1 which is for "cold weather option/twin turbo" vs. the replacement I got C28125 which just says "twin turbo". Should I return it and get the /1 version? Anyone know the difference the fuzzy white part makes?

VAB5 · 03-27-2021, 11:20 AM

I did some more Googling, and it appears to be for driving in blizzards, where snow might get sucked in and saturate the paper/clog the filter. The fuzzy prevents that from happening.

I'm sure if that's wrong, someone will correct me!

03-27-2021, 10:35 AM	#1
VAB5 Private 21 Rep 57 Posts Drives: '15 535; '15 328; '05 ZHP conv Join Date: Mar 2019 Location: VA iTrader: (0)	Engine air filter: Is this piece important? I ordered a Mann C28125 engine air filter from Amazon, which matches the part number of the BMW air filter I pulled out except for a /1. The replacement is missing the fuzzy white material pictured below. It was glued to the BMW air filter. Looking closer on Amazon, there's a C28125/1 which is for "cold weather option/twin turbo" vs. the replacement I got C28125 which just says "twin turbo". Should I return it and get the /1 version? Anyone know the difference the fuzzy white part makes? Last edited by VAB5; 03-27-2021 at 10:40 AM..
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03-27-2021, 11:20 AM	#2
VAB5 Private 21 Rep 57 Posts Drives: '15 535; '15 328; '05 ZHP conv Join Date: Mar 2019 Location: VA iTrader: (0)	I did some more Googling, and it appears to be for driving in blizzards, where snow might get sucked in and saturate the paper/clog the filter. The fuzzy prevents that from happening. I'm sure if that's wrong, someone will correct me!
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