Rislone Ring Seal Smoke Repair 473ml Rislone Ring Seal Smoke Repair is formulated to help stop blue exhaust smoke, reduce oil burning and prevent plug fouling caused by blow-by. Rislone Ring Seal contains viscosity improvers that thicken the oil film, filling these gaps. Rislone’s Ring Seal Smoke Repair High mileage formula is specifically designed for older higher mileage engines. Viscosity improver cushions and coats engine parts helping to reduce wear and quiet noisy engines. All weather formula retains oil flow characteristic in hot and cold weather. Works on gasoline and diesel engines with conventional, high mileage and synthetic engine oils. Can be added anytime, top off oil when low or while changing oil. Repco stock the widest range of head gasket repair, engine flush, and rear main seal repair fluids that can keep your car in tip top condition. An abundance of switches and sensors throughout an engine provide vital feedback to monitor its condition but any of these can contribute to poor running or excess fuel consumption if permitted to get clogged or dirty. Repco stock a range of engine additives to help combat this and ensure your engine is working its best.