I have had bad experience with Castrol RS 10W-60 in my previous car (Opel Astra GSI Turbo) there have been traces of burnt out oil... For my new Renault Twingo RS I bought Shell Helix Ultra 5W-40 (RN0710), mainly because I use Shell V-Power (RON97), as RON98 is more difficult to find these days, because it is replaced with RON95 Eco fuel everywhere. But Total Quartz 9000 5W-40 and Twingo RS OEM oil, Elf Excellium 5W-40 were on my shortlist to, but Elf is difficult to find and Total has sold the only 2 Total gas stations in my town. And I could buy the Shell with serious discount!
Silkolene and Fuchs are from the same factory, right? And a different class / style of Synthetic, right? Nice too!