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Office of Defects Investigation - An office within the National Highway Traffic Safety Administration that conducts defect investigations and administers safety recalls, and that monitors the adequacy of manufacturers recall campaigns.
Off-Road Ready - A vehicle with high-ground-clearance outfitted for the rigors of traveling on non-paved roads.
Oil Can - A condition where a dent in metal will ′pop′ in and out, like the bottom of an oil can.
Oil Filter - A cartridge-filled canister placed in an engines lubricating system to strain dirt and abrasive materials out of the oil.
On-board Diagnosis System - A computer-controlled system that identifies malfunctioning or out-of-adjustment components under its control through the display of trouble codes. The presence of trouble codes is usually indicated by an intermittently or constantly lit "check engine " or "service engine soon" light.
One-Touch Windows - Vehicle windows with a changeover switch that is capable of automatically rolling the window glass completely up or down (as well as functioning as a conventional momentary power window switch).
Opera Coupe - A two-door hardtop with a small folding passenger seat, for easy access to the rear seat (usually offset to the right in left-hand drive cars).
Optional Equipment - Equipment that is not included in the manufacturers base configuration of a vehicle.
Original Equipment Manufacturer (O.E.M.) - The term is generally used to distinguish between parts made by the original builder and the aftermarket.
Overpressure Safety Switch - A switch used on a turbocharged engine that warns the operator of excessive and potentially harmful intake pressure that may be caused by component malfunction.
Oversquare - An engine with a bore longer than its stroke. Most postwar motors have an oversquare design. Oversquare engines can rev higher, but at the expense of low-end torque. An oversquare engine will typically produce more horsepower and less torque than an undersquare one.
Oversteer - A handling characteristic of a vehicle that causes it to turn more sharply than the driver intends because the rear wheels are sliding to the outside of the turn.
Oxygen Sensor - In a computer-controlled, fuel-injected vehicle, a sensor mounted in the exhaust stream that relays air/fuel ratio information to the fuel control computer that allows the computer to make adjustments.
Here is a list of various Automotive Definitions. These are not specific to just Classic Cars, but covers all Automotive Definitions in general. This is not an all inclusive list and as we come across more, we will add them here. Drop us a note if you see something we missed.
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