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Old 08-26-2018, 04:20 PM
Nadir Point Nadir Point is offline
Oil Burner
Location: Colorado
Join Date: Dec 2013
Posts: 287
Mein Auto: 335D
Originally Posted by alacey View Post
I am only concerned about once a year intervals when I change my air filter which is about 25k miles on my 328d. If my UOA shows silicon levels no different than with the prefilter versus without it, then I will switch to without it of I see or feel any improvement.
I don't think you understood my post you quoted at all. Unless you are measuring air filter restriction with a vacuum gauge or FillterMinder and tracking your change intervals you will never notice any difference except how long it lasts before you need to change it. The only time you could possibly EVER see a UOA effect from an OEM or OEM-equivalent air filter is if it is physically damaged or defective and/or improperly installed.

Last edited by Nadir Point; 08-26-2018 at 04:24 PM.
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