All I can say is I'm getting much better gas mileage, its 10% greater and I no longer use any oil. Come time for my oil change I use to see about 1/2 quart down on the dip stick. Now it shows full on the dip stick. I never see the foam on the dip stick either, it always look like any other oil in color to me. If you put oil and Lucas stabilizer in a gear box with straight teeth gears you will put air in the oil, It was engine noise in cold weather that made me buy it, says it coats ehgine parts and it did quite it down. So what if it foams. I know my parts are coated with oil, Lucas is made from oil, its an oil product, oil from oil. Call it an additive, your adding oil to oil.