Which Engine Coolant Additive Brand Wins?

premixed ready to use, claims to reduce engine wear, inhibit corrosion, and seal pinhole leaks, boilover temperature up to 265 degrees F, freeze protection to minus 26 degrees F

cool down runs up to 30 degrees cooler, reduces cylinder head temperature by up to 75 degrees F, lubricates all vital components, marketed for racing, street, RVs and tow vehicles

reduces engine temperature by up to 25 degrees F, up to 75 degrees cooler cylinder head temperature, lubricates and protects water pump seals, helps prevent corrosion of metals including aluminum

allows the engine to run up to 30 degrees cooler, combats electrolytic and chemical corrosion, reduces existing scale buildup, protects against radiator core damage

cooler, fights corrosion, electrolysis, and erosion, contains lubricant to protect the water pump

boilover protection up to 26 degrees F and freeze protection to minus 28 degrees F per the product label, which the presenter notes had little other information printed on the container

water based formula that will not protect against freeze ups, claims to reduce engine temperatures by up to 30 degrees F and meet ASTM corrosion standards, contains lubricant to protect the water pump

high performance waterless engine coolant, claims to boil over at 375 degrees F, protect to minus 40 degrees F, eliminate engine hot spots, fight corrosion, and lower pressure

lower than most of the other brands

brought the peak antifreeze pH down slightly from 8.47 to 8.32

the same as the unboosted peak antifreeze

lowered the peak antifreeze pH slightly from 8.47 to 8.42

the highest baseline alkalinity of any product tested

the least alkaline baseline of any product tested

very close to the peak antifreeze baseline

by far the best reserve alkalinity of the individually tested products, holding the lead over Red Line's 6.87, second place overall behind Evans

described as the best yet at that point in testing, tied with Engine Ice's post acid reading

described as helping strengthen the antifreeze's reserve alkalinity a little versus the unboosted antifreeze's 6.26

moved into the lead at that point in testing ahead of Rislone

moved into the lead at that point in testing

tied with VP Racing Additive

the most acidic result of any coolant tested

by far the best of any product tested

about 5 degrees cooler than the peak antifreeze baseline

transcript reads roughly 230.1 degrees F in a garbled passage, described as performing about the same as the DEI Relief boosted antifreeze, kept verbatim with ambiguity flagged

second place behind Evans Waterless overall in the boiling point test, though this specific figure is only given in the closing summary rather than the individual product breakdown

transcript reads roughly 231 degrees F in a garbled passage (captured as 23.1 in the raw transcript), kept with ambiguity flagged, described as not performing quite as well as Rislone

about the same as the unboosted antifreeze

lower than the peak antifreeze baseline

transcript reads roughly 22.4 degrees F in a garbled passage, described as boiling very close to the same temperature as plain water, kept verbatim with ambiguity flagged since the literal digits do not match a plausible boiling point

by far the best of any product tested, over 100 degrees F better than the competition

a few crystals at the top at the intermediate freezer check, fully frozen along with the other non Evans coolants by the final minus 47 degree F check

about the same crystallization progress as DEI Relief at the intermediate freezer check

just a few crystals at the top at the intermediate freezer check, frozen by the final minus 47 degree F check

top third crystallized at the intermediate freezer check

close to the same crystallization progress as VP Racing Additive at the intermediate freezer check

the first ready to use coolant to fully freeze solid, around minus 32 degrees F at the intermediate freezer check

the first product to fully freeze, already completely frozen at the initial minus 27 degree F freezer setting, before the freezer was even made colder

still in liquid form at the final minus 47 degree F freezer check when every other coolant, including the plain peak antifreeze, had frozen; presenter concludes its crystallization point is colder than minus 47 degrees F

the smallest wear scar of any product tested, described as coming out on top, with Red Line barely trailing at 6.1 mm

performed better than the Rislone and DEI Relief boosted antifreeze but not quite as good as the plain antifreeze

a small amount larger (worse) than the plain antifreeze's 6.36 mm

trailing Rislone's 6.42 mm by a small amount

tied with VP Racing Additive

a little more wear than most other products at that point in testing

slightly better than Engine Ice

described only as clearly worse (larger) than Red Line's 6.1 mm, no exact figure given

second place behind VP Racing Stay Frosty

moved into the lead at that point in testing before Engine Ice and VP Racing Stay Frosty were tested

about the same as Rislone

moved into second place at that point in testing

moved into the lead at that point in testing

the best of any product tested in this specific test

performed close to the same as a regular unboosted antifreeze, the worst heat exchange result among the ready to use coolants