Engine Sludge Problem
Engine sludge is a recognized concern for several types of automobiles, notably Volkswagen / Audi, Chrysler, Toyota, and Saab. Sludge is caused by oxidation of the oil due to prolonged high temperatures. The oil loses viscosity and becomes like jelly, i.e., sludge. The sludge then obstructs the flow of oil to lubricate the engine. It can result in the total failure of the engine and require engine replacement.
The manufacturers have taken a hard line approach to this known engine sludge problem. Some, like Volkswagen, require that you produce records of all oil changes, so keep your receipts. Consumers should consider having oil changes done at the dealer, even though it may cost more. Make sure that the date, time, and mileage is recorded on the receipt. That way there will be a record kept at a source that is easily checked, but keep your own records too.
A common approach of manufacturers is to tell the customer "no" at the dealership level. Most customers will not pursue it any further. If you have a vehicle with an engine sludge problem, and the manufacturer is not honoring the warranty, please feel free to contact our office.