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Q: 2001gmc 5.3 engine with 130000 mile antifreeze leak on 2001 GMC Sierra 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
replaced water pump, flushed coolant system, new coolant. coolant level will stay up and then drop for no reason. mechanic tested coolant, head gasket. nothing found. now water or coolant in oil.
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