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Point-of-Order: Dexos specs did not officially "exist" until 2011 Camaros; Technically, our 2010s only require the older GM spec (can't recall it right now), which Castrol does officially meet. Castrol probably just didn't want to pay GM's extortion to be listed Dexos1. As far as I recall, there is no technical merit to Dexos over the old spec, it's just more CAFE crap (could've missed something, though--I quit paying attention since I'm runnin' 2010 rules).
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