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For quite some time I have studied the characteristics of almost all available engine oils with Ford WSS-M2C913-D (A/B/C) approval and I managed to identify, probably, the best 3 engine oils meeting Ford WSS-M2C913-D specification.
Maybe it's just a coincidence, but all 3 engine oils are the brainchild of German engineering.
The first one comes from Germany's additives specialist - Liqui Moly Special Tec-F 5W-30.
What Liqui Moly Special Tec-F 5W-30 has to offer? It is a highly refined oil obtained via syhtese technology (HC - hydrocracking), with a very good viscosity index of 179 and a high T.B.N. (total base number) value of 11.1 mg KOH/g, which means that this oil has a very good temperature stability, retaining the proper viscosity during operation and it has a very high ability to neutralise the acids forming inside the engine preventing corrosion. In terms of oil consumption it may require some topping up from time to time between changes because of its evaporation loss value of 12 %.
The second one comes from the other "bad boy" of German engineering by the name of Ravenol FO SAE 5W-30. It is a highly refined oil obtained via syhtese technology (HC - hydrocracking), with ACEA A5/B5 and API SL approvals. While this oil has not been sent for additional OEM approvals, according to Ravenol it is tested in aggregates requiring WSS-M2C913-D and MB 229.6 oil specifications. By studying Ravenol FO SAE 5W-30 product sheet one could come to the conclusion that this oil is not something worth noting. But, pay attention to the MB 229.6 specification, which will discuss later.
The last, and maybe the best of all, comes also from Germany, by the name of Ravenol FDS SAE 5W-30. This time we have a PAO (polyalphaolefin) based, fully synthetic engine oil, with good thermal stability (VI - 163 and HTHS - 3 mPas), good alkaline reserve (TBN - 10.1 mg KOH/g) and a very good volatility loss value of 8.9 %. In conclusion, a very effective engine oil. The most interesting fact is that Ravenol FDS SAE 5W-30 has not only the official approval from Ford for WSS-M2C913-D specification, but also the approval from Mercedes for MB 229.6 specification.
What MB 229.6 specification approval means? It is a special oil specification, not backward compatible with any previous Mercedes specification, based on ACEA A5/B5 - 2016 specification and it is issued exclusively for gasoline engines and is therefore not suitable for diesel engines with or without exhaust aftertreatment system.
The differences between Ford WSS-M2C913-D and Mercedes MB 229.6 specifications are illustrated below:
https://photos.app.goo.gl/asvFQGTnmTat6uXF6
 

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Mercedes MB 229.6 specification requires higher quantities of wear, dispersant and detergent additives leading to better wear protection, less piston deposits and sludge formations. These requirements, coupled with Ford requirements for more antioxidants ensure that the engine oil doesn't become too thick to work its way where it should. All these requirements are met by the Ravenol FDS SAE 5W-30 engine oil, which, in my opinion, is a very well engineered oil and the only oil up to date approved both against WSS-M2C913-D and MB 229.6 specifications.

My edit time window has expired, and I had to continue in another post.
 

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Discussion Starter · #3 ·
For anyone wondering why some Ravenol FDS SAE 5W-30 engine oil canister label don't carry Mercedes MB 229.6 specification approval on the label, here is the new label, with MB 229.6 statement:
 

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