No way @DUB6 ! There's no use of ALL CAPS to blurt out half-baked advice...how could I let something so well-written influence with my fantastically brilliant and stunningly insightful work? 🤣
But also a good time to double check the freeze protection of your cooling system. My car was shipped up from AZ to WI 2 weeks ago and just before sub-zero weather arrived I decided to double check the freeze protection and was surprised to learn it was just protected to about 30 degrees. Turns out the guy in AZ had drained the radiator to replace the temp gauge sensor and just filled back with water - not thinking about the cold the car would soon experience in my unheated garage. I dodged a bullet by checking and addressing the coolant mix!
Jesse gives good info above, inc. your heater serving as a small auxiliary radiator if needed.
Avoid antifreeze like the plague lest your car exposed to two consecutive nights of a hard freeze--30 or below--- or has air conditioning, in which case you need 15% antifreeze to prevent the heater core from freezing even in Phoenix or LA in August.
Otherwise, all you need is reverse osmosis water and a good rust/corrosion preventive like No-Rosion.com -- and make sure to read their tech info link-- or Red Line "Water Wetter." Nothing else.
Cars run cooler with straight water if you don't need antifreeze. This allows you to advance your timing a little for better performance and fuel economy.
Soluble oil is a dated practice. Like antifreeze, it leaves a heat transfer inhibiting film on coolant passages. You do n o t need a water pump lubricant.
Never use distilled water, which is ion hungry and leaches minerals---like lead, tin, solder -- from your radiator and cooling system.
I expected responses like those from "72stang" and dond who reply before reading the No-Rosion tech link cited. No-Rosion was originally formulated to protect the dissimilar metals in monstrously expensive industrial cooling towers:
Re: Red Line Water Wetter, Roy Howell, their chemist, is a Cornell grad and member of the SAE, with CEO Tim Kerrigan since Red Line's 1979 founding. Like SAE member Jay Ross's No-Rosion, Roy & Company also caution against distilled water.
Dond, no, you do not need "water pump lubricant." A late Phi Beta Kappa industrial chemist friend, a lifelong gear head extraordinaire, holding two patents reminded us that water itself is a good lubricant for the carbon seals of most water pumps of older cars.
If you're saddled with a 1936-48 Cadillac or LaSalle V-8, which Generous Motors being Generous Motors -- as a lifelong Packard, Mopar, FoMoCo, Stude, Pierce-Arrow fan and national parts purveyor who'd early on been service mgr. at a Cadillac dealership dismissively termed GM -- you have a water pump straight out of 1930, which has a packing gland requiring periodic attention, such vintage-- even Edwardian-- constructs another matter. But we note that's likely off subject as most here gathered have little interest or curiosity in the 120 years of automobilia, only mid-sized egregious '60s Motown tin stuffed with station wagon engines, stumpy rear axles, racing stripes and silly decals, or regurgitated press releases of the latest must-have super car du jour for the arbitraging, mall developing, silver spoon .001 %.
You might hold Hagerty's feet to the fire to provide more than Walter Mitty PR fluff and paeans to things barely out of Kelley Blue Book.
A Chrysler engineer member of the Auburn-Cord-Duesenberg Club years ago described the drawbacks of soluble oil, or the need for any "water pump lubricant."
As Kendall Oil/ Conoco Phillips petro-chemists, themselves owning a range from prewar Packard to well-tweaked Camaro pointed out during another "must-have" round, this time a certain motor oil additive: "If you want to stay in business, you give the public what they want, or t h i n k they need."
Let's not reinvent the wheel nor pick and choose the precepts of chemistry and engineering to play online gotcha.
With winter here for many of us - don't forget to double check the freeze protection of your cooling system. My 68 Chevelle was shipped up from AZ to WI 2 weeks ago and just before sub-zero weather arrived I decided to double check the freeze protection and was surprised to learn it was just protected to about 30 degrees. Turns out the guy in AZ had drained the radiator to replace the temp gauge sensor and just filled back with water - not thinking about the cold the car would soon experience in my unheated garage. I dodged a bullet by checking and addressing the coolant mix!