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The answer to this question can be found by anyone on most oil company sites.
This is an example of one company's answer.
Myth: You can't mix brands of motor oil.
Fact: Mixing brands is not the best practice because the additive systems in each may be different and when mixed may not function as efficiently as desired. However, no serious problems will occur if you must add a different brand of equivalent quality between oil changes. It is very important to maintain proper oil level.
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Oldndumb
Caveat lector
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