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 & conditions fuel Excellent for engine storage | Seafoam Sea Foam Motor Treatment 16 Oz