Elf oil Synthetic question

[VR46-G@Z]

Hi guys, from reading numerous threads etc I think we all prefer Fully Synthetic 5w40 Oil for the F4R engine for general use and spirited drives, track days etc... My question is Renault recommend (RN0700/RN0710) Elf 900 SXR 5w40 which they label as 'synthetic technology' but from research it seems it isn't a Fully Synthetic.... However they do an Elf 900 NF 5w40 Oil which is actually a Fully Synthetic oil yet doesn't seem to have the (RN0700/RN0710) label like the SXR oil, yet I presume the NF is a better option being Fully Synthetic.... Can anyone shed some light on this for me? Cheers, Gaz.

 

[VR46-G@Z]

Since reading further it seems SXR is supposed to be Fully Synthetic, so now I'm confused as to how these oils are different in any way? Also the Full-tech LSX oil is supposed to be the best they do but doesn't seem to have the RN0700/RN0710 stamp, I'm confused...!

 

[fivepointnine]

Looks like it is at least a group III oil as the viscosity index is greater than 120 (172 actually) and it is listed as fully synthetic on the Elf website.