Elf Evolution Full-Tech FEX 5W-20

Worth knowing

Of the three models that the data sheet excludes (the Ka, Focus ST and Focus RS), the Ford codes show the reason for two. According to the article on Ford WSS-M2C codes, the second-generation Ka requires 917-A and the Focus RS with the 2.5 Duratec requires 937-A, that is, a 0W-40 at ACEA A3/B4 level, whereas 948-B means a 5W-20 of class C5. Nor does 948-B cover some Duratec 1.3, 1.6 and 1.8 engines, which are specified for 913-D.

For the newer 1.0 EcoBoost, oil data sheets name a separate standard, WSS-M2C954-A1, for a 0W-20 oil, and, according to the oil maker, its requirements place particular stress on compatibility with a timing belt that runs in oil. An oil with a 948-B approval, as the same article emphasises, does not become a 954-A1 oil, so this 5W-20 is not meant for an engine whose service book lists that code. In the Evolution Full-Tech range, the 954-A1 approval is held by Elf Evolution Full-Tech VCX 0W-20.