Can motor oils of the same brand be mixed?

1 Answers
StEloise
07/29/25 5:42pm
When topping up motor oil, it is recommended to use the same brand and type of oil. If the oils are from the same brand but different types, they can be mixed, but it is not advisable for long-term use. The reasons are as follows: 1. It alters the oil composition: Motor oil is primarily composed of base oil and additives, and different types of oil are not identical. Mixing two different types of oil, while maintaining the lubrication properties, will inevitably change the oil composition. 2. It may affect the engine: The altered oil composition could have adverse effects on the engine, hence long-term use of mixed oils from the same brand but different types is not recommended.
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