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Willy uses the Pro Honda 50-50 premix. No problems so far.

Coolant level is measured on the centerstand with the engine hot & cold. The positions of each are marked on the overfill tank with small black sharpie dots. As long as the level lives between these dots all is well.

Note that liquids like coolant expand when they heat up. As they expand, the overflow needs somewhere to go. The overfill tank is made to catch this overflow. When shut down, the engine cools and the coolant retracts to its original volume. The overflow tank returns this "delta" volume to the coolant system. This is why the level is different from hot to cold. Stability is what you want in this system-no movement of the dots. And you don't want the overflow tank to go dry.

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View from rear tire looking forward.
 
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You know, they've had aluminum engines in cars for 50 years. Why do we have to LOOK for "silicate free" antifreeze? Why wouldn't ALL antifreeze be silicate free by now?
Silicate free is not specific to alloy engines, its for tight tolerance water pumps.
You only need the silicate free coolant with water pumps with tight tolerances (typically small engines and motorcycles), silicate adds wear to the surfaces in those tight tolerance applications. Any number of vehicles dont run water pumps with those tight tolerances so they can use the silicate mixes with no impact on performance. Most coolants for modern engines that look after both alloy and steel components are colour coded green, red and blue depending on the design requirements of the engine but of course there are always exceptions Honda typically being clear for some reason and others being white.
 
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