When you shop at a car dealership, watch out for expensive add-ons and costly financing. Often items like extended service contracts, “theft etch” and “GAP” are a rip-off, and usually you can get a better rate on the financing yourself, by shopping around.

For example, many service contracts and extended warranties have fine print that excludes “pre-existing conditions.” So if the engine blows, your claim may be denied when the provider blames the problem on a lack of maintenance by a prior owner, or a component that was supposedly faulty when you bought the car.

How much extra do add-ons and dealer-arranged financing cost? They can add $5,000 or more to the price of a car, without adding any real benefit. Of course, car dealers push add-ons aggressively because they are so profitable — for them.

According to Automotive News, in the first quarter of 2018, AutoNation, the country’s largest new car dealership chain, averaged a gross “finance and insurance” profit of $1,779 per unit sold. That’s just their profit.

Bottom line: If you want to save big, it’s smart to get your own financing and decline the high-cost / fat-profit / low value add-ons.