After prolonged exposure to high heat, engine oil can oxidize and break down, forming deposits known as sludge. This gelatinous goo can block vital oil passages, resulting in thousands of dollars ...

An engine gummed up with oil sludge can cost thousands of dollars to repair and in many cases must be replaced. The class action settlement could potentially cost the automaker hundreds of ...

DETROIT - In the latest example of Volkswagen of America Inc.'s quality woes, the automaker is warning 426,000 VW Passat and Audi A4 owners of an engine oil sludge problem. Affected are 1.8-liter ...

The threat is the buildup of sludge -- gooey tarlike deposits -- that reduces or shuts off oil circulation and can mean thousands of dollars to repair or replace an engine that has seized.

The video opens with the on-screen caption: “Engine sludge is a serious problem nowadays! Should we be shortening the oil change intervals?!” Cooke Jr. stands next to the engine of the 2018 ...