Redline Water Wetter – Product Review

We all love a bit of magic in a bottle, right? K Seal, injector cleaner, engine flush, Jack Daniels. It’s all good stuff. But what about a bottle of worryingly tasty looking (don’t drink it though) fluid that promises to make your engine run cooler? That sounds too good be true, right? But that’s exactly what Redline Water Wetter promises. I wasn’t too sure about these bold claims, mainly because I couldn’t get my head around the term ‘water wetter’. It sounds daft. However, the reviews were full of people keen to laud this fluorescent, melted Slush Puppy of a liquid for its apparent cooling abilities. Pah, I thought. Before clicking the ‘buy’ button. You know, for research.

Buy your Redline Water Wetter here.

The Product

Redline is an American company that has been making all manner of automotive fluids since 1979, so it’s safe to say it knows what it’s doing. With a catalogue that includes oils, flushes, additives and more, with a great many geared at performance use, it’s safe to assume they’re at the top of their game. But even so, a 355ml bottle of liquid that cools your engine? Too good to be true, surely? Redline claims that its Water Wetter “lowers temperatures by reducing or eliminating bubbles or vapor barrier that form on hot metal surfaces”. It also has anti-corrosion agents within it, too. You simply add it to your expansion tanks, and away you go. That’s all there is to it. But does it work?

The Test

As the owner of a ’90s Rover, keeping the engine cool is etched into the forefront of my mind. To such an extent that where the interior clock once was, there is now a Durite capillary temperature gauge, because such gauges don’t lie. The gauge also means I know exactly how the engine temperature is fluctuating. I know where it should be, I know how it behaves on a run, around town, or at idle. I know exactly when the fans kick in, too. This made the car the perfect testbed. So, I dumped the bright pink juice in my header tank, and then went on a 45 mile drive to see what was what.

The Result 

And it only bloody works, doesn’t it? The temp behaved, but was approx. 5 degrees lower than normal, even lower again on a long A road run. It really did bring the temps down that little bit. Of course, I set it up by having a freshly flushed cooling system (it won’t work as well if you’re pumping rust water around), but even so, colour me shocked. I didn’t think it would actually do anything. And for £20. Bargain. I know my car, I know the temperature range in which it operates and how it behaves in different environments. I watch that Durite dial like a hawk, and as such, I’m 100% confident this magic juice has made a difference. This is a must have for any classic car owner.

The Verdict – 5 out of 5

Overheating is the one thing classic car owner hate above all else. This Water Wetter from Redline is a must have. It does exactly what it says on the bottle, and it does it with apparent ease. Just make sure you flush and clean your cooling system first to get the most out of it.