Can synthetic oils be used for longer periods, or will they prolong the engineâ s life?
It is always best to follow the vehicle manufacturer’s (the OEM’s) recommendation for oil drain periods. Some OEMs do permit extended drain intervals when high quality, high performance synthetic oils are used. This is often done in combination with extended vehicle and engine service intervals, as it is in the OEM’s interest to ensure the engine and the oil will require servicing after longer and longer intervals. However, because most oil marketers ensure that their expensive, synthetic oils are also the best in terms of performance, when only a normal oil drain interval is observed the oil will give excellent protection to the engine and thus contribute to extended engine life.
