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Forgot to add....GM (and every other auto manufacturer) reccomend you come in every 12-15k miles and spend $150-$450 on TB cleaning and an upper induction cleaning to help remove the deposits caused (restore MPG and power is how they word it) by the oil ingestion....lots cheaper to prevent it in the first place as every time you do an upper induction cleaning some of the hard carbon gets trapped between the piston and cylinder wall causing scouring...that adds up over time.
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