Seeing smoke? We can help. Our Ring Seal Smoke Repair is formulated to help stop blue exhaust smoke, reduce oil burning and prevent plug fouling caused by blow-by. We talk to customers every day about this, so we know a thing or two about the problem, its cause, and how to fix it chemically. Blow-by is usually caused by gaps in internal engine parts resulting from excess wear. Rislone's Ring Seal Smoke Repair contains viscosity improvers that thicken the oil film, filling these gaps. It also provides a seal for worn pistons and rings and cushions engine parts to reduce wear and friction. In other words, it's a car lifesaver in a bottle.