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Boy oh boy oh boy! This would appear to be a head gasket leak and/or warped block. Obviously your fuel is contaminating your engine lubricant. Did you have an engine overheating event very recently? This is going to be a big bucks repair whether you do it yourself or have it done professionally. I'd seriously be scouting for a replacement vehicle because the repair will be well over what resale of your Buick will bring. Good luck and keep me posted as to what the mechanics' prognosis/estimate is. swabby
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