Pennzoil High Mileage 10W-30 Conventional Motor Oil is engineered for cars that have accumulated more than 75,000 miles, particularly those that are experiencing oil leaks and oil burn off. Engines with higher mileage tend to experience more wear than new engines. As your car ages, leaks may develop and cause higher oil consumption and burn off which is why your engine might be needing frequent top-offs. Severe oil consumption and oil burn off may also cause other issues, leaving deposits on the internal parts of your engine.