It is more expensive than other products on our list, but it’s one of the most popular and highly rated synthetic oils available. If you have a diesel engine and want a synthetic oil option ...

they cost more than comparable synthetic motor oils. For instance, five quarts of Mobil 1 Extended Performance 5W-30 High Mileage Motor Oil costs $32.47 (it's currently on sale on Amazon for $29. ...

Synthetic is better. A lot better. "[S]ynthetic oil outperformed conventional oil ... You aren't going to hurt your engine if you skip the Mobil 1, one of the best-known synthetics.