Additive.
Chemicals that are added to basic oils with the purpose of improving performance, or adding characteristics that it previously did not have.

Lubricant.
A substance capable of reducing friction in a mechanism that works under movement, weight, pressure or temperature.

Roller Bearing cranking.
Generally refers to a sound made by the crankshaft or the connecting rods. It is usually due to excessive space between the oil and the bearings.

Detonation.
(or explotions) are caused by a malfunctioning spark in the combustion chamber or by faulty air-fuel mix.

Freezing.
Ice formation in the carburetor. The air admitted into the carburetor naturally contains humidity, which is cooled by the gasoline’s evaporation, forming ice around the blocking valve. Also, if snow enters the carburetor and blocks the moving pieces such as the articulations, that water enters an evaporations-freezing cycle that does not allow the carburetor to operate properly. This in turns makes the car’s movement unsteady and unreliable.

Start failure.
This condition is caused by an incomplete burning of the air-gasoline mix in the combustion chamber.

Overgear.
Generally, when the engine is working at a speed that is above all recommendations we call this “overgear”. The recommended speed is set in order to lengthen the working life of the engine. “Overgear” is usually shown as the red zone in the car’s tachometer. If the engine runs in this red zone for a prolonged period of time, there is soon danger of damage.

Filtration and leaks.
This is when an engine suddenly stops due to an extremely high working temperatura. High temperatures make gasoline boil and invade the carburetor and causing an overly rich air-fuel mix.

Pre-Start.
Pre-start is when la air-gasoline mix burns before the spark plug is able to properly burn it.

Piston cranking.
This cranking happens when the pressure created by combustion is excessive, causing the piston to slam against the cilinders’ walls. This happens frequently when there is too much room between the piston and the wall.

Valve beatings.
These irregular beatings happen when the frequency of the valves’ spring coincides with the frequency of the movement of the camshaft. These irregular valve beats is often the result of an engine working in overgear conditions. It may damage the pistons and valves.