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As to oil consumption, any car with 129,000 miles on it will use some oil. Also, nine year old car has a lot of years of heat that has probably hardened some seals and gaskets, so there can be a bit of oil leakage. If you are at 800-1000 miles per quart, I wouldn't worry about it except to keep up with checking the oil and don't let it run low.
Overall, the Diamante is a reliable car. During the years that it was reported on in Consumer Reports and Carpoint it had a very good record. A lot depends on the quality of the mechanics that work on it. Even the most reliable car can be ruined by improper shop procedure.
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