This product should not affect oil consumption. If the vehicle had substantial intake valve deposits, it’s possible that the product could give the appearance of burning oil while the deposits are washed off the valves into the combustion chambers. If that is the case, then the smoking will cease once either the valves are clean or the vehicle is filled up with fresh gas.

Sorry I wasn't more clear. I was trying to suggest a high mileage engine whos' rings are beginning to show their wear, could allow more oil into the chamber after being cleaned. So an engine that is slightly smoking out the exhaust could possibly smoke even more after B12 cleaning?

While we’ve never been made aware of such an occurrence after the use of either Step 2 or Step 3, it’s theoretically possible in a high-mileage engine that there could be carbon buildup on the compression rings and in scratches of the cylinder walls that, when thoroughly cleaned-up, could contribute to smoking.