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it came from the factory with an AC delco filter and good luck on finding one at your local advance or auto zone. I got mine at my local chevy dealer for 6 bucks and i went with mobil 1 full synthetic. I hear the CTS comes from the factory with synthetic and i figured it would be best. Another thing, anyone notice that the oil life meter is a little off? At 3000 miles my meter said i was at 70 something percent. I looked at the manual and it said change oil every 3000 miles and the computer was way off. Can anyone explain that?
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