[oiljohn]

I'm going to use either super tech or prestone. Honda charges 28 bucks for a gallon of 50/50 coolant (they can keep it). Not sure what my Toyota charges. I will change it (drop and fill) at 12K. Have 9400 on it now.

 

[oiljohn]

I've used prestone and super tech long life coolant in my 2005 camry (185K before trade in) and my accord (141K now) with no issues. I'm a chemist and Honda and Toyota get the same people to make their fluids as after markets. they scare you to buy their fluids. the only one I use is Honda power steering fluid. Otherwise, it's all after market stuff and I've never had an issue.

 

[oiljohn]

good point. the extended fluid uses sodium ethyl hexanoate as the additive. I make that where I work. 8 carbons, carboxylate or organic acid. Hope this helps.

 

[oiljohn]

all the new fluids in the aftermarket to compete with the dealers is equivalent. they have chemists working at Castrol and the like to analyze and make similar fluids. Just cheaper than the dealer. Equipment in the lab and science is such that you can determine what is in there and at how much down to PPB's. I'm going to do a viscosity test on the WS Toyota trans fluid and the super tech low viscosity fluid for comparison. I'll post soon to let you know.