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06 Cadillac STS
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352 Posts
Discussion Starter #1
Just curious what oil comes in a V6 from the factory. Per my owner's manual, the V8 takes synthetic, V6 fossil. Yet..........the oil filler cap on my V6 engine says "Mobil 1 5W30". I always use full synthetic in all of my vehicles anyway, so I'm not asking what oil I should use--just wondering why the cap does not match the manual.

Plus, my first 2 oil changes are free as I have coupons from the dealer. I don't know what type of oil they will use, or if I will have to pay the difference if I want synthetic. Car only has 2600 miles on it, so haven't had first oil change yet.
 

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I've had this engine in both a 2004 CTS and now a 2007 STS. It takes synthetic oil. I haven't checked the manual, but the dealer will follow what's printed in the engine compartment. That is the authoritative source. It is common for a spec change to be made to a vehicle or engine that doesn't get reflected in the manual.
 

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2008 CTS
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16 Posts
My Dealer states it's Mobil 1 even though the owners manual says that V6's don't need it. And that's what they put in.
 
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