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    Changing oil makes engine burn it faster?

    Hi everyone, I have a 2000 Pontiac Grand Am with the 3400 V6 engine with about 270,000 km's (167,000 miles) on it currently. In 2018 I had some engine work done by my mechanic, I had both heads port polished with the oil valleys opened a bit wider for more oil flow, new head gasket, new valve...