I and others can appreciate that it seems your volunteering to fix our transmissions if we use that un approved by Honda and Toyota fluid, in our vehicles, and end up with some sort of failure.
Idemitsu Type H Plus ATF isn't approved by Honda, but is approved by Idemitsu for use in Hondas in place of DW-1. I'm very confident in Idemitsu.
Maxlife Multi Vehicle
Full Syn ATF isn't approved by Honda, but is approved by Valvoline for use in Hondas in place of DW-1. I'm confident in Valvoline. I'm also confident in Glenda's knowlege.
Valvoline Extra Protection Full Syn ATF isn't approved by Honda, but is approved by Valvoline for use in Hondas in place of DW-1. I'm confident in Valvoline.
According to my 2 months of research all over the Internet... Many people are using Maxlife Multi Vehicle Full Syn ATF in Hondas and the vast majority report
good results. Many are using Valvoline EP FS ATF in Hondas and report
excellent results. Very many are using Idemitsu Type H Plus ATF and
all report
excellent results.
In fact for VEPFS & ITHP people who have used them in Hondas longterm report they work
better than DW-1.
I know one respected BITOG member who told me in a PM that he used MLMVFS ATF in a Honda and had a transmission failure 10K miles later. He is the only person I've heard of having a problem using MLMVFS ATF in a Honda. Dozens of other people all over the Internet who have used it longterm say it's fine. I think it's probably fine, but that's not a unanimous experience/opinion. Whether his AT failure was fluid related we'll never know.
ITHP ATF is unanimously lauded for use in Honda by those who have used it longterm in place of DW-1. In fact, all longterm users said ITHP works great and shifts
better than DW-1. I've read the same from longterm users of VEPFS in Hondas, but there are not as many people using VEPFS in Hondas. ITHP is the most popular, widely used substitute for DW-1. In my opinion, ITHP is an upgrade.
For marketing and greed reasons, Honda isn't going to officially approve another brand of oil for use in Hondas. However, some Honda dealerships use other brands of oils with good results and save customers money.
When
respected oil companies approve their products for use in Hondas, it's plausible that it's a valid claim, but each claim has to be validated by research and people brave enough to try it longterm, find out, and post about it. FAFOPAI
In the case of the 2 Valvoline ATF mentioned, they've been researched and used enough that they're known. Same with Idemitsu only moreso in regard to Hondas.
My 1st choice for a DW-1 replacement is ITHP ATF. My 2nd choice is VEPFS ATF. MLMVFS would be my 3rd choice. There's probably other good choices by other oil companies, such as Castrol or Mobil, but I don't have any info on those.