Under Engine Splash Shields
https://www.ebay.com/sch/i.html?_nkw=1645201670
https://www.google.com/search?q=164-...hrome&ie=UTF-8
these parts exist for aerodynamic and noise reasons, both things subject to German regulation. Fuel economy relates to aerodynamics, of course.
They exist on all German brands, and save for boxer engine Porsches, all provide for topside oil extraction to avoid need to remove the shield for maintenance.






