I would like to say your product is great. I purchase a bottle of synthetic oil stabilizer, and added just a small amount to top it off and bring it to its level, it has synthetic oil in the engine already; The very next day i notice a difference in acceleration and runs smother. Its a 1991 chevy astro van (which i purchase in 8/2011) from what i know they have a tendency to leak at the intake valves seals, every morning when i start the engine i blows a clouds of blueish smoke, with ur product i have notice a decrease in smoke when i start the engine ( its better then a cloud). this is a good sign that ur product is working. i must have used 15 to 20% of the product and i still have more then half of the bottle.

keep up the good work
mike L. -  lynwood ca.