Originally Posted By: CharlieBauer
Good point. But it was interesting that they showed less "wear" from such a thinner oil film. Also, the tested Toyota Aygo is specified for a 0w20 in Germany. Castrol suggest using this oil:
http://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/DBC578FA40A7A62E802580A4003C1A56/$File/BPXE-AHGR23.pdf
Yep, Ravenol says to use their HTHS 2.4 oil anywhere an HTHS 2.6 oil is recommended. It doesn't seem like it leaves much room for possible fuel dilution. Without fuel dilution, I think it would be fine. If you compared the 0w16 Ravenol to a good 0w20, fuel economy would probably only improve by, guessing, 0.3% or so.
I am wondering about those wear claims too. Sometimes a thick C3 oil won't get to the rings as well, creating a little more wear. Alternatively, Ravenol has some genuinely good performing additives which handle metal to metal well.