Full Synthetic Oil can be worth the extra cost for your car or vehicle as the Synthetic Oil does provide protection for your engine and can reduce engine sludge.
Using Full Synthetic Oil in your car or vehicle can also extend the mileage you can go before you need an oil change.
Synthetic Oil also handles higher temperatures and does not thin out as much as regular oil does either.
If your vehicle has over 150,000 miles or more than using synthetic oil can help extend the life of your engine as long as you change the oil and oil filter as often as required.
With Synthetic Oil you can usually go up to 10,000 miles or even 15,000 miles before an oil change is needed.
With regular oil you would usually need to change your oil every 3,000 to 5,000 miles.
Most people drive 10,000 to 20,000 miles per year so the extra cost in buying the more expensive synthetic oil could save you some money and protect your vehicle.