Was the Corolla included in the oil-sludge buildup in engines of some Toyota models, a few years ago? You might want to check that out. Also, is your Corolla one of the years included in the recalls? There are indications that some of the defects identified in the recalls went back several years. The U.S. government regulator, NHT-SA is currently investigating that the 'sudden acceleration' defects date to 2002 or earlier.
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