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rcisneros4 posted a topic in Cadillac CTS, STS 2005+, 04-09 SRX, CTS Sport Wagon (Sigma)Hi, I was wondering what kind of synthetic oil I must use for my Cadillac, perhaps this is why I have car troubles. And what oil viscocity (5W-"something" or 50w-"something") should it be and what other oils am I capable to use?