Oil for MB with *warm* start knock issue

[OVERKILL]

Sorry, but your Ravenol link is for diesel engines, MB-Approval 229.51. Mine is for gasoline engines, MB 229.5. My initial point still stands, that this MB approval process has become ridiculous. So long as I use a top-grade 5w-30 synthetic, like Red Line Performance, the official MB Approval is unnecessary.

229.51 is not for diesel engines, it is for both gasoline and diesel engines, it's just low-SAPS.

If you pick an oil from the BEVO 229.51 list:

Mercedes-Benz Betriebsstoff-Vorschriften

Die Mercedes-Benz Betriebsstoff-Vorschriften zeigen eine Übersicht der Anforderungen der im Fahrzeug benötigten Betriebsstoffe und der empfohlenen Produkte. Betriebsstoffe sind alle zum Betrieb eines Mercedes-Fahrzeugs / Aggregats erforderlichen Flüssigkeiten bzw. Schmiermittel z.B. Kraftstoff...

bevo.mercedes-benz.com

Like say M1 ESP 0w-30, you'll note that it says it is for both:

Here are the MB requirements from Afton, you can compare 229.5 to 229.51, which are basically identical. You'll see that the main difference is that 229.5 is based on ACEA A3/B4, whilst 229.51 is based on C3. Ergo, the sulphated ash limit for 229.51 is lower and the starting TBN can be lower.