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Opposite Lock
Turning the wheels opposite to the direction the car is heading.

 

Octane

A number that indicates the anti-knock quality of automotive gasoline.

Odometer
An instrument, usually located in the same housing as the speedometer, for measuring and registering the miles and tenths of miles driven.

Oil Pan
A removable part of the engine, usually made of pressed steel, that attaches to the bottom of a cylinder and acts as an oil reservoir.

Oil Pump
An engine-driven pump that delivers oil to all the moving engine parts.

O-Ring
A type of sealing ring usually of rubber or similar flexible material, that is compressed into grooves to provide the sealing action.

Overdrive
Generally a small auxiliary gearbox, usually mounted behind the car's main gearbox or attached to the differential, giving another gear in addition to the other three or four speeds in the main transmission.


Overhead Cam

A camshaft located above the cylinder head or heads instead of in the cylinder block.

OHC (Overhead Cam)
A camshaft located above the cylinder head or heads instead of in the cylinder block.


Open End Lease
With an open-end lease, there is still a residual value set at the beginning of the lease. However, if the car is worth less than the residual value at the lease's end, the lessee must pay the difference. In other words, the lessee assumes the risk for depreciation with an open-end lease.

Opportunity Cost
The cost of what you didn't do. For instance, if you have the cash to buy a car, the opportunity cost of the purchase is the interest lost on the cash you used for the car. One of the often-cited advantages of leasing is that it frees up your money to invest elsewhere.

OHV (Over-Head Valve)
Valve-in-head engine in which the valves are directly above the piston.

Over-Head Valve (OHV)

Valve-in-head engine in which the valves are directly above the piston.

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