BlueDevil 00203 Radiator Flush & Oil Degreaser - 32 Ounce,Gray

This worked better than I expected. My old engine had sat for years with water in the cooling system and there was a lot of rust. One treatment with this product flushed it completely clean.

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After using this product car got worse and had to get a radiator flush first from mechanic then it still needed a new rad for car $1800 later. Took weeks to get repaired. I wouldn't buy this and suggest going to straight to the mechanic before using this product.

If you have an engine that's been sitting a while make sure to put a filter of some sort on the outlet hose before the radiator. I used this stuff and clogged my radiator it did such a good job cleaning junk out if the block. The product works amazing and does exactly what it says.

I have a Jeep TJ that the previous owner mixed the wrong radiator fluid. It looked like rusty mud. I throughly flushed the radiator with hose water to get as much sediment out. I let that all drain out and closed the petcock. I poured the radiator cleaner in first then added my water until the system was full. I then ran the vehicle for an hour around town. Let the vehicle cool and drained the fluid. It took me about 8-10 of these flushes to get the system clean. Don’t not leave this cleaner in for more than 4 hours. I also did my flush in the summer. Do not use water to flush the system in the winter months. I can’t say that the cleaner made a difference. However it didn’t hurt. It’s important to keep your cooling system clean. Like I said I had to do 8-10 flushes on my system but my cooling system was really bad. The vehicle runs very cool now and the heater works really well. I hope this helps.