DETROIT -- Volkswagen of America Inc. has extended its warranty coverage of certain Passat and Audi models for problems caused by oil sludge, which can cause engine damage.
In the past few days, the company has sent letters to about 400,000 Volkswagen Passat and Audi owners informing them of the extended warranty, Volkswagen spokesman Steve Keyes said Tuesday. The company took the measure after receiving reports of engine problems caused by sludge, a buildup of old or dirty engine oil that thickens and hinders engine lubrication.
The problem generally is caused by failure to change the oil on time or by the use of low-quality oil, Keyes said. It affects 1998 to 2004 Passats and 1997 to 2004 Audi A4s that have a 1.8-liter turbo four-cylinder engine.
Volkswagen is extending its usual five-year, 50,000-mile warranty to eight years with no mileage limit on repairs related to sludge, Keyes said. The additional warranty is fully transferrable.
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