Assenmacher Specialty Tools OFAUD1000 Euro 1/4 Turn Oil Filler Funnel
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
https://asttool.com/detail_page.php?...mber=OFAUD1000
A special aluminum connector with a common screw on funnel for when the oil filler cap is under the cowl.
https://asttool.com/detail_page.php?...nge%20Products
https://www.asttool.com/detail_page....nge%20Products
A little anodized aluminum and stainless steel make this the uber oil funnel for BMWs.
They make similar oil funnels for other car manufacturers like Toyota.
Cheers