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Construction Babysitter
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I have a 1/2 gallon of Rotella 5w40 synthetic and a 1/2 gallon of Valvoline Blue 15w40 on the shelf from previous oil changes. Would it be acceptable to combine those two with 2.5 gallons of rotella T 15w40 or delo 15w40 on my next oil change to get them off of my shelf, or is mixing different oil brands bad?
 

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Not going to hurt a thing. In general I prefer to keep syn and dino sep but in this case we are not talking true syn anyways and honestly it not a big deal. Why waste the oil or just let it sit.
 
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