BlueDevil Products BlueDevil 00203 Radiator Flush and Oil Degreaser, 32 oz, Grey

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.

Bought this for an old diesel farm tractor. It seems to have fixed the issue as has been over a year now. Pleased with the product. Will try again if the need ever arises.