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I posted that to show that the benefit of the higher MPG is small, but if people want to go after it, that is their choice, and many people like a challenge.

I would guess that rubbery parts
.... hoses, seals, vacuum lines
would have their service life shortened
by increased temperatures.

I would guess that aluminum to cast iron junctions,
like cylinder heads, manifolds
would be most likely to warp at higher tempertures.

I would not think that cast iron against cast iron parts would be affected much.

Since bore wall wear goes down with increased coolant temperature
(Continental Motors research)
I would guess that maybe piston ring wear would go down too.

Much of this bore, ring and piston wear
is from acids that are best kept as vapor,
never as a liquid (electrolyte allows corrosion)
so higher temperatures that are above the mixture's boiling temperature reduce corrosion.
Similar to 50/50 anti-freeze and sea water,
these mixtures of acids in water boil at temperatures above 212 F.

Continental Motors now mainly makes aircraft gasoline engines, and I for one was sad to see the press release last month where they were sold to a Chinese company.

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Not really sure how acids in the coolant effects the bore and rings. If you have coolant and coolant vapor in those locations your problems are a lot bigger. Generally, you're not "boiling off" anything as the system is normally maintained below boiling conditions. Finally, mineral acids have a higher boiling temperature than water, so if you boil an acid solution, the acid concentration in the remaining liquid likely remains the same or goes up. It would be type of acid specific.

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