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Instead of wasting the 10w-40...could it be mixed with what you normally use? What would happen if you used half of each? Or use a jug of 5w-40 (assuming it's 5 liters/5 quarts?) then topping off the rest of what you need with the 10w-40 (I don't know how much oil the n55 takes).
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2015 F06 650ix Gran Coupe`(Moonstone/Cohiba Brown)| 2014 F15 X5 50i MSport (Space Gray/Mocha)
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