The oil filter removes most particles and contaminates from your engine’s oil to protect your engine’s internal moving parts.

The oil pan is where the oil in your engine is stored.

The oil pressure sensor measures the pressure at which your engine’s oil is flowing. If the pressure becomes too high or too low, the oil pressure sensor sends a signal to the vehicle’s oil pressure warning light. If you see

The oil pump takes oil from the oil pan and pressurizes it, allowing it to travel throughout the engine and lubricate the engine’s moving parts.

Overdrive is a transmission gear that allows the engine to turn at a reduced rpm for a given road speed.

Overheating occurs when an engine reaches too high of an operating temperature. Overheating may lead to potentially significant engine damage.

The owner’s manual is the booklet supplied with all cars when they are sold new. It is usually placed in the glovebox. Your owner’s manual contains information about the equipment your car has, what kinds of fluids and lubricants to

This is a gear found only on automatic transmissions. The park gear locks a vehicle’s transmission in place, preventing the car from moving.

This is a switch found on many modern automatic transmissions that prevents a vehicle from starting unless the gear selector is in park or neutral.

Neutral (gear). Neutral is actually not a gear. When your vehicle is in neutral, the gearbox and engine are completely disconnected. Thus, your car is able to roll freely whether the engine is on or off.

An acronym for Oxides of Nitrogen, a primary emission produced in the combustion chamber under high temperatures when nitrogen combines with oxygen. Oxides of nitrogen contribute to the formation of smog.

A fuel octane rating measures a fuel’s resistance to knocking or pinging.

The odometer measures how many miles are on your vehicle.

Over Head Cam (OHC). An overhead cam engine has its camshaft in the cylinder head, above the valves and cylinders. This allows the camshaft to directly open the valves without using pushrods.

The ohm (symbol:

Lug nuts attach a car’s wheel to its hub.

Manual chokes have a cable that lets the driver control the carburetor’s choke operation. Most newer cars with carburetors have automatic chokes instead of manual chokes.

With a manual steering system, there is no power assist to the driver.

A manual transmission is a transmission with a clutch. In addition, it is up to the driver to select gears.

A Malfunction Indicator Lamp (MIL), commonly referred to as the Check Engine Light is an indicator of malfunction of the computerized engine management system. It is found on the instrument console of most automobiles. When the MIL is lit, the