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I was talking to a guy at the BMW Ultimate Driving Experience this weekend and he said that the Castrol Oil used in the BMWs aren't actually fully synthetic. He told me it was really close but not 100% synthetic. I don't know much about oils and not sure if this guy was trolling me. Any ideas on what he could be talking about?
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2011.5 JB/FR/ZCP/ZP2/ZCV/DCT/Heated Seats 
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