I read that Idemitsu ATF is the same fluid as Honda DW atf. I wonder if this oil is the same thing as Honda branded dealership oil?
Idemitsu is the supplier to Honda, but the formulations are slightly different.
Is either formula better than the other? Would an Idemitsu 3 quart drain/fill “play nice” with the existing Honda DW?
I can't say which might be better.
I know which one is "better" for a vehicle under warranty.
I run idemitsu trans fluid in my Titan with confidence - Idemitsu is one of the few ATF refiners that have matching vs "universal" trans friction formulas.
Out of warranty Id still probably stick with Honda - or at least do a full fluid exchange over to idemitsu - -
curious why change formulations at all ? Whats your reason to want to do it? - no judgment just curiosity.
Bernardi auto parts is a good source for genuine honda fluids.