Seafoam motor tuneup cleans dirty engine parts internally by removing harmful gums, varnish, and carbon buildup. Removes moisture from oil crankcases and fuel tanks. The oxygen sensor-safe cleaner stabilizes and conditions fuels to prevent them from becoming stale. Excellent for engine storage. For peak performance use Seafoam every 5, 000 miles. 16 oz. Stabilizes and conditions fuel Excellent for engine storage | Sea Foam Motor Treatment 16 oz