Royal Purple 01600 Purple Ice Super-Coolant Radiator Additive - 12 oz.

Used two bottles and water instead of antifreeze because does not freeze here in Las Vegas and has made temps noticeably cooler and doesn't rise at all when doing a 1/4 mile

great product to improve performance of cooling system

Works great

Quality products

There was no apparent change in operating temps for the 2004 Toyota Sequoia (4.7L), but then again, Toyota Gauges (at least in the Sequoia's) were and probably remain notorious for being 'wonky'.i.e. its oil pressure gauge typically reads low, until it doesn't, then it does again. The analog gas gauge is also a delight, usually showing the gas level with reasonable accuracy, but other times appearing to be empty, complete with the illuminated idiot light, even after a recent fill up, when you know darn well there is plenty of gas in it.With such suspect gauges, the heat reduction on her vehicle is inconclusive. I'd have needed a thermal reader with her vehicle to compare the before and after.Even so, the RP Ice provides lubrication for the thermostat and water pump (though most pumps are sealed now), plus its anti-corrosion elements are beneficial.I had added some distilled water to the 50/50 mix radiator fluid for the ideal ratio for better performance of the RP Ice additive in both vehicles that maintains an appropriate freeze protection for our location.I've since read that using purified water in radiators is better than using distilled. It may be that distilled water pulls minerals from the internal metal surface areas into the radiator fluid? Regardless, I used what I had on hand (distilled).However, my 1992 (350 CID/ 5.7L) Chevy Cube Van's analog gas gauge indicated a drop of at least a 10° F from it's previous normal operating temperature, perhaps up towards 15° F temperature drop after being left to idle up to operating temperatures twice, then IRL driving about and on a cross country trip towing a 14' cargo trailer.

I still like to drive one of my older cars regularly. Over the years it appears that there's some build-up that just will not flush out of the engine. This only affects the car when the Houston temperatures get into the mid to upper nineties. The car does not overheat but it runs hotter than I would like.I tried the purple ice, Which coincidentally I installed during a multi day period Of nearly 100 deg. temperature days. To my amazement my engine temperatures were lower (even when compared to the gauge reading during the lower 90 deg. temperature days).There are people out there who believe that your car engine thermostat will just adjust to compensate for any improvement the product may cause thus rendering purple ice ineffective. However think about this logically, the reason a person would add this is because during periods where your thermostat is completely open and is unable to provide any more cooling your temperature may still increase.... and this product is able to help disperse that increased heat in some way by its chemical formulation... again, Your thermostat is fully open and your engine temperatures continue to climb non the less....adding this can helpAnother way that this product indicates its effectiveness is that my engine takes longer to reach operating temperature by about triple the time. So this product is absolutely doing something to help the coolant release heat. And for those that think that there is a problem with driving your car for 15 to 20 extra minutes before it reaches operating temperature asked them to phone their friends in Wisconsin Minnesota Alaska in other extreme cold States and they will find that this is normal for a few months a year with no adverse effect on your car engine reliability....Sorry for being so long.. this product works

I've used this and I used the Redline Water Wetter. I saw a good bit of cooling with the Redline but didn't see any with the RP Ice. I'm a big fan of Royal Purple products but I got to go with the Redline Water Wetter on this one.

Added when I did the last flush. Keeps car cool and radiator clean.