Cadillac CTS Noises Rattle

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Mobil 1 Synthetic Oil Weight

2004 CADILLAC CTS
My Car Calls For 5w30 Mobil 1 Synthetic Oil, But I Think I Need A Thicker Oil Based On A Slight Valve Rattle. Would It Harm My Engine If I...
1 ANSWER
Asked by bigcee65

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