Dealers are very good at detecting whether a vehicle has mechanical problems. Dealers pick up tell-tale signs that a transmission or engine is close to failure, and can hide such problems. For instance, if an engine is “ticking,” it signifies that it may need an expensive valve repair. Replacing the engine oil with a thicker oil will quiet the ticking enough to fool an unsuspecting consumer. Shortly after the sale, the consumer is stuck paying for the expensive repair. If a dealer knows about a problem, and lies to you about it, they have committed fraud.