I have used this a couple of times as an oil treatment on a Dodge 4.7 Magnum V8 with 200k miles and a Toyota 2.4L I4 with 130k miles. Following the instructions, shortly before I was planning to change the oil, I added some Sea Foam to the motor oil and drove around for 100-300 miles. It seemed to do a good job clearing the sludge out of the engine, and the engines seem much happier after the treatment.
Rating:
[5 of 5 Stars!]