How Often Should I Change Oil With Castrol Full Synthetic?by Sean Farmer
Six Months or 10,000 to 15,000 miles
Most synthetic oils, such as Castrol, are rated to last between 10,000 and 15,000 miles or six months. These ratings are only recommendations typically applied to "normal driving," and do not reflect severe driving conditions that may require more-frequent oil changes.
Three Months or 3,000 Miles
If you drive less than 10 miles a day or have to start your engine more frequently, you may need to change your oil more often. Doing so also allows a mechanic to look at a vehicle more frequently and possibly detect problems.
Everything depends on your driving habits. While synthetic oils like Castrol are rated for up to 15,000 miles, it is often a good idea to change your oil a little sooner than the rated mileage. Consult your vehicle's scheduled maintenance in your owner's manual for the best time schedule to follow in changing your oil.