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The Odometer is the instrument on your dashboard that displays how many total miles the vehicle has traveled. It is illegal to tamper with your odometer and display fraudulent mileage to a prospective buyer.


Oil lubricates various parts of your car’s engine, thereby reducing friction so that the parts move easier. Engine oil also cleans the engine, inhibits corrosion and helps cool the engine by carrying heat away from moving parts. Gears and other mechanisms in your car also require oil for lubrication.

Oil Change

An Oil Change is the act of removing the used oil in your engine and replacing it with new, clean oil. Over time, oil breaks down and gets dirty. These factors make oil much less slippery and less effective at their job of lubricating engine parts. That’s why it’s important to change your oil according your car’s specifications.

Oil Filter

The Oil Filter is designed to remove contaminants and debris from your engine’s oil so that they don’t get circulated into the engine where they can cause damage.

Oil Pump

The Oil Pump circulates engine oil to the rotating bearings, the sliding pistons, and the camshaft of your car’s engine. If your engine is running hot, oil pressure is low, or you’re hearing engine noises, there could be a problem with the oil pump.


The Overdrive setting on your car lets you drive at a steady speed while the engine reduces its RPM. This reduces wear on your engine and provides for better fuel efficiency.

Overhead Camshaft

The Overhead Camshaft is a valvetrain configuration where the camshaft is located above the combustion chambers. This configuration delivers better engine performance and more speed to the vehicle. It is also easier for mechanics to work on this type of configuration.

Overhead Valve

The Overhead Valve is a type of piston engine that places the camshaft within the cylinder block and uses pushrods to move the rocker arms, which in turn opens and closes the valve. While the overhead valve configuration offers comparable performance to the overhead camshaft design when the engine is not pushed to high RPMs, it is a more cumbersome design that requires more mechanical labor when problems arise.


Overheating is when your car’s engine is running too hot. Too little antifreeze can cause this problem, particularly if the antifreeze is leaking or not circulating through the system properly because of a faulty uptake hose. If your engine is overheating, you should pull over, stop the car, and let the engine cool down. If you are not in a position to immediately stop the car, you should turn the heater on, which will temporarily cool the engine a bit until you can pull over and assess the problem.

Overload Shocks

Overload Shocks are designed for vehicles that carry heavy loads. These shocks provide extra cushioning and spring so that the struts can handle the car’s weight and still provide a safe, comfortable ride.


Oversteer… it looks great in car commercials when the back-end of a car is skidding sideways on a shiny surface where there are no obstacles around. But it’s not so good for ordinary drivers! Oversteer occurs when the rear tires of a car lose their grip on the road when heading into a turn. When that happens, the back end skids out. To avoid this and the serious damage it can cause, you should approach turns slowly and cautiously, especially in the rain.


Oxidation is the interaction of oxygen with other substances. Rust is a common side-effect of oxidation, and when it comes to cars, oxidation damages paint and the metal beneath it. Sealants on paint help combat this naturally occurring process, but over time oxidation can damage your car’s parts and appearance.

Oxygen Sensor

The Oxygen Sensor is part of your car’s emissions control system. It is located in the exhaust pipe and designed to ensure your engine is receiving the correct fuel-air mixture by measuring the ratio contained within the exhaust.