Mobil Super 10W-40 is a higher-viscosity premium synthetic engine oil that offers proven protection to help extend engine life by helping protect against sludge and engine wear. It's formulated to protect in warm and cold temperatures. Mobil Super 10W-40 comes with a 5,000-mile protection guarantee. Because 10W-40 is a viscosity used in many older vehicles, you may also want to consider Mobil Super High Mileage 10W-40, which is specially designed for vehicles with more than 75,000 miles.