Lineartronic is Subaru's name for a continuously variable transmission.

Lineartronic offers a fully-automatic mode and a manual mode which has fixed gear positions, which can be selected using paddles mounted behind the steering wheel.

Lift is an aerodynamic force in an upward direction.

Car bodies tend to generate lift at speed.This reduces the weight on the wheels, which can reduce grip and cause instability.

Lift can be reduced by careful shaping of the body, or using aerodynamic devices such as aerofoils.

Lift is the opposite of downforce.

l/100km Litres per 100km (fuel consumption)

lb ft Pounds feet - torque unit

LCD Liquid crystal display

LED Light emitting diode

LO lubricating oil

LPG Liquified petroleum gas

LPT Light pressure turbo

LSD Limited slip differential

A lock-up clutch is a device which prevents slip in a torque converter, improving efficiency and reducing fuel consumption.

A torque converter is one type of coupling between engine and transmission. It allows slip between the input and output which is desirable when moving away from standstill. But when cruising there is still a small amount of slip in a torque converter, and this wastes fuel. To avoid this, a lock-up clutch can be incorporated to make a mechanical connection between input and output, ensuring that there is no slip. The clutch releases when the gearbox changes down.

A leading shoe in a drum brake provides better braking effect than a trailing shoe.

The difference between leading and trailing shoes is in the position of the shoe pivot. A leading shoe is pivoted at the end of the shoe facing in the opposite direction to the rotation of the drum. So on the right-hand side of a car travelling forwards, a shoe facing the front of the car would be leading if it was pivoted at the bottom.

Leading shoes provide better braking because there is a 'self servo' effect: as the friction material grips the rotating brake drum the geometry of the shoe means it tries to wedge or 'sprag' on the drum, and this pushes it into closer contact - increasing the brake force. By contrast, a trailing shoe is constantly being forced away from the drum and so offers considerably less braking force.

A leading shoe becomes a trailing shoe when travelling in reverse.