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I flushed out the main UTV today and pulled one of said weepy thermostat housings. It does appear to be some glass filled nylon, but it is very deformed -- the sealing faces are about 0.035" (~0.9 mm) out of flat. The whole housing is slightly bent like a banana. The bolt heads and o-rings...

A plasticizer could (in theory) only contribute to greater rates of creep deformation. I have no certain information about what those parts were made from, but if their geometry makes them borderline insufficient for their application and mechanical loading, then more plasticizer isn't going to...

I never really did mention my rationalization of using the PHOAT in the other machines. The PHOAT easily has a 5 year service life. I figure that the ATVs are all aluminum and don't really need any of the anticavitation capability of the red ELCs. Any good xOAT would be fine. If I consider...

Let me rephrase that. Valvoline is the only one that publishes meaningful data. If I can't trust that products designed to appear equivalent are in fact equivalent, then I have to assume it's little more than dexcool dyed red, with maybe a little more surfactant to improve anticavitation...

I just realized that the NAPA and other store brand "Red NF ELC" does use 2-EHA. At least that's what the label photos say. Maybe that's old info, but the price suggests it's plausible. I guess that's another complication to watch out for if I choose to worry about it. Good gravy. What a...

Hm. I did manage to talk briefly with someone at valvoline. They said that neither the NF or NOAT ELC use 2-EHA, which seems to be the big gasket bogeyman. I don't know which gaskets/seals (i.e. materials) are the issue. Is there really a coolant that can't bear being used with an...

Hello. I threw an email at valvoline a while ago, but I guess they didn't care for my dumb questions. I've been dredging through posts on coolants here, so I might as well attempt to collect second (n-th?) opinions here. I maintain a range of road vehicles and ag machines, and my shelf of...