We have owned one of our vehicles since 1996. It has 283,000 miles on the the engine. We have regularly maintained the vehicle with Mobile one synthetic oil from the time we bought it. Even with high mileage, our automobile continues to be a reliable one thanks to our regular use of this product. It has saved engine wear over the years and proven to be a high quality product. If you plan to keep your car for a while, I would highly recommend Mobile 1!