Jasemas is kinda right, the Honda FEO 10w30 is API SL, a 15 year old spec which is quite a bit inferior to SN or SM in terms of protection, You need the FEO ultra to get SM spec (old feo ultra is 5w30, it's now 10w30), which is still an 10 year old spec, SN is the "Latest" so to speak...
Which just means honda wants you to pay premium price for crap (more or less)
Now the USDM Honda full synthetic 5w20 is API SN.... Which is made by Diametsu (spell?)
In Australia/USA group 3 base oil can be called fully synthetic, thanks to Castrol winning that lawsuit back in 1990's.
Group 3 is basically highly refined mineral oil....
In Europe however you'll need to be at least group 4 to be called synthetic.
Group 4 = PAO
Group 5 = Ester
NOW back to topic of ATF and Honda auto tranny, honda ATF-Z1 is bascially mineral base oil with a crap load of Zinc, ATF-DW1 is pretty much the same but thinner (except in canada, where they use a synthetic base....), the blend was reported as being not aluminium friendly at all.
No chance in hell im using Mineral base oil in a tranny for 80k km....
Bookmarks