Greetings LL-
I ordered a Samsung 65' NeoQLED 4 days ago, Price was $900 delivered. Yesterday, price was $1800 for the exact TV from that vendor. Other vendors had the same price. Not complaining, but what's up with the crazy price increase?
I replaced 17 yo coolant. Cooling system looked new and coolant was pristine. Asked myself "why am I doing this?" Peak says their stuff is "lifetime", now I believe them. YMMV
I think they call it "convection" flow, at least that is what my physics class called it. Its used as emergency backup reactor cooling in subs.
Regarding no circulation in braking system, observational evidence seems to contradict that in my experience. Master cylinder seal wear darkening fluid...