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I bought this to remove oil contamination after a blown head gasket. Other cleaners had failed to remove the oil completely, probably atteched to the cooling hoses. I used the Prestone exactly as directed, draining the system, adding the Prestone and topping up (with distilled water) and running the car, at fast idle, for 60 minutes. I then drained off and flushed twice with distilled water and the system appeared really clean with no trace of oil appearing in the top of the radiator. This product really froths in action, rather like a strong detergent (which it is) and certainly cleans out oil. I cannot say how well it eliminates scale as my systems are always filled with antifreeze and distilled water but this is the best degreaser I have found.
Verified purchase: Yes | Condition: New
Used this on a 1993 of mine. Absolutely got every bit of gunk out when used properly. The system has never worked so well. The heater now blows red hot.
Verified purchase: Yes | Condition: New
very pleased with this product did a quick job of cleaning cars coolant system made big improvement to heating system.
Verified purchase: Yes | Condition: New
Read the manual, apply and you will get excellent results like I did. I selected this product after long research, compared and selected this.
Verified purchase: Yes | Condition: New
Followed the instructions and success..radiator now completely hot all the way through. Brilliant saved money on having to buy a replacement. Thank you
Verified purchase: Yes | Condition: New
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