That's a very valid point. We know there are three major classes of coolants, so Prestone's claim like that should raise an eyebrow immediately. But how do you tell good "recommendations" from bad?? For one I'd trust Mobil's more than I would Prestone (I don't use any Prestone aftermarket product). And Toyota does use re-labeled Mobil products.
For example, Mercedes and BMW require a top grade of 5W-30 with sufficient film strength, so some said. But you'll see no such recommendation on the US Mobil-1 5W-30. Instead, the one that makes the grade is Mobil-1 0W-40, and it says so on the bottle.
(In other words, if prices are similar, get your 5W-30s from MB or BMW).
BTW, Valvoline filed a complaint against Prestone's "All Makes" claim with the National Advertising Review Board (NARB) in 2006. But looks like Valvoline didn't prevail, or at least the FTC didn't mind. But this does damage other "recommendations" unfortunately.
Every multi use ATF says that about virtually every application.
> There's a difference between what the oil company recommends and what
> has been approved by the manufacturer. Prestone "recommends" that you
> use their All makes All Models coolant in everything. Would you?