Synthetic motor oil replaces conventional motor oil. Although synthetic oils from different companies are not chemically identical, the oils can be mixed.
Differences in synthetic oils: motor oil from different brands can be mixed
All synthetic oils are made in basically the same way. The key differences between synthetic oils are the additives in the oil and the percentages of each additive. Both synthetic and conventional oils have additives designed to improve the performance of the oil.
Synthetic oil manufacturer’s recommendations: oils from different brands can be mixed
Synthetic oil manufacturers state that it is an acceptable practice to mix synthetic oil from different manufacturers. In fact, synthetic oil can also be safely mixed with conventional oil.
Reasons for mixing synthetic oil: Different brands of motor oils can be mixed
Car owners may need to add a liter of oil every now and then before an oil change. For reasons of convenience, a car owner can choose to use a different brand of synthetic oil and can do so without worry.