BlueDevil Products 00203 Radiator Flush & Oil Degreaser - 1 Quart

I followed instructions but did a hybrid approach where the car idled for 20 min and then I drove it for 20 min. Let the car cool some and drained. Only 4 qt of the 6.6qt came out and it was pretty dirty. After the clear plastic water container sat over night you could all the blackish sediment at the bottom. I filled with distilled water , idled the car until thermostat opened and drained again. Repeated until the water appeared more clear. Took some time but I know the system is clean and the flush is fully out.

Works as stated

Be aware, they advertise the stop leak stuff on the bottle because using it could start leaks in your cooling system. however if using this causes a leak, then it showed you where your metal was getting thin, its better to have it start leaking in your driveway then a few months from now out on a highway. it cleans out the rust, sometimes the rust is keeping it from leaking, if you see rust coming out in the water, that was once your engine, so try not to get it too clean. if you know what i mean?

Worked. I've talked to some that just added it to the system with out thermostat removal or flush. I filled the directions as far as thermostat removal and flush. Worked well in both scenarios

I followed the directions to a "T", it worked!

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.

Someone left this old diesel filled with water and it sat for years. I flushed it out first just to get the horrible stuff out first. I then filled and added the treatment and ran it a few time over 4hrs to circulate it. Drained and saved it in a 5 gallon container for disposal at the recycling center. Still had lots of rusty water so I repeated it again. 2nd time was the charm! Works good.

Maybe I had a pretty rough case of mixed fluids in the cooling system but it didn’t really do a good job of flushing the radiator out..