Yes...don't do this unless your sure your engine has no leaks! I had this done to my high mileage Honda and the day after I got it back the engine died (on the highway!) because flushing it out opened up some previously unnoticed wounds at the gaskets. The car ran fine beforehand, but the Valvoline guys seemed so sure that doing this would improve the car's overall performance. It took me almost a month and a half to properly reclog the openings with "goop" again! after I did the engine ran like new for another 4 years before I finally had it fixed correctly. Josh VIN 5102 VIN 15964 doctor who wrote: > has anyone had there engine flushed out w/a machine that is deisigned to get > the goop out of the engine. > does anyone have any experience w/this? > > thanks in advance, > dr c.