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Color is largely irrelevant since they can add dyes and there will always be production variances. Royal Purple is dyed purple, Torco is dyed blue, Motul 300V is dyed green, etc.
They are of course fine to mix, it's a requirement of API certification that oils be mixable.
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Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan
Past: 2011.5 M3 sedan ZCP
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