- L -

LSW

Low swirl combustion.

LT

An acronym for Light Truck.

Lu

Lutetium An element with the atomic number of 71.

LU-Jetronic

A United States version of a Bosch pulsed-electronic, fuel-injected system having a lambda sensor.

Lubricant

1. A substance, usually petroleum based, used to coat moving parts to reduce friction between them. 2. The new synthetic product poly alkaline glycol (PAG) and ESTER used with new refrigerants. 3. A term often used to identify an organic mineral-based grease or oil product.

Lubrication Guide Book

A specially prepared publication, detailing required lubrication services with related information for each make and model of automobile.

Lubrication Interval

Manufacturer's recommended mileage and/or time limit when periodic lubrication services should be performed as a part of a preventative maintenance program.

Lubrication System

The oil pump, filter, hoses, lines and passages in an engine that facilitate the oiling of all moving parts.

Lug Bolt

A hex-headed, threaded bolt used to hold the wheel on a vehicle.

Lug Nut

A hex-sided, threaded device used to hold the wheel on a vehicle having lug studs.

Lug Stud

A threaded protrusion used with a lug nut to hold the wheel on a vehicle.

Lugging

Running an engine at less than normal rpm, causing it to balk.

Lumbar Support

A seat support for the lumbar portion of the occupant's body.

Lumen

The unit of measure for the amount of energy in a beam of light.

Luminescent

The property of a material which emits light when energized by radiant energy.

Lump

A large, heavy engine.

Lunch

To severely damage or destroy something, such as an engine.

LUS

Lock-up solenoid.