Originally Posted By: PeteTheFarmer
Quote:
Lately, many here have been recommending Peak GL (an OAT) for Honda and Toyota (who's coolant contains phosphorous...a HOAT?).
You've mentioned an possible discrepancy I've also noticed. One might expect that using phosphate together with an organic acid would make antifreeze HOAT,
but I've only seen that acronym used for antifreezes that contain silicate.
As far as using Peak Global in Asian vehicles, I use it in my Honda because I don't know of another aftermarket product that comes as close to OEM. It's organic acid, non 2EHA, and has no silicates. So far no issues.
Good call Pete. You are correct about the Japanese extended life coolants being OATS. I will join Donald in "standing corrected".
IN this this excellent article I have shared here many times:
http://www.gates.com/brochure.cfm?brochure=2822&location_id=2877
it states: "Honda and Toyota use a new extended-life
OAT coolant-made with sebacate as the only organic acid-no 2-EHA. Sebacate isn't quite as effective in combating corrosion at lower pH levels, but because that's more of a cast-iron issue, it apparently didn't concern the Japanese. Both Honda and Toyota do continue to avoid silicates, but add a dose of phosphates to provide fast-acting aluminum protection, particularly to recoat the water pump after cavitation erosion/corrosion.
The article also points out that OATS use 2-EHA and/or Sebacate as the organic acid while G-05 HOAT uses benzoate as it's organic acid.
Too many details! I want the old days back, in spite of the "green snot of death".