Review on 🔧 K&N High Performance Engine Air Filter: Washable Replacement Filter for 2007-2019 DS/Opel/Peugot/Vauxhall/Mini/Citreon (DS3/S4/S5/S7, Grandland, Cooper Countryman, C5, C4L) - Model 33-2936 by Ines Jones

Always a fan of k&n. That extra noise and now I can hear the bypass valve. I was concerned at first because the check engine light came on after installing it. I checked that it is the mass air flow sensor. I cleaned the sensor and found that there was some synthetic oil on it. After cleaning everything is fine. I noticed excess oil on the filter when installed, but I assumed it was the correct amount from the factory. I had to erase a bit, but now I know. All in all, I'm still a k&n fan and will definitely be buying more.