I tried this on my 603... it is WAY more messy then running with no valve cover. There is an oil jet pointing straight out... and it moves a lot of oil in a very brief time Running at idle with no valve cover made almost no mess in my expierence.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.