Older vehicles often burn oil, leading to exhaust smoke and damage to oxygen sensors, catalytic converters and other internal components. Rislone’s Smoke Away Engine Oil Treatment with Stop Leak stops oil leaks, restores oil for longer life and thickens the oil film filling gaps between parts to prevent blow-by. Conditions seals to stop leaks and cushions and coats internal parts to reduce wear and quiet noisy lifters (engine ticking). Smoke Away (p/n 34326) is compatible with all gasoline and diesel engines using conventional or synthetic oil. One 500 mL bottle treats four to six quarts of oil.