It depends on what kind of engine the scooter has. 2 cycle engine oil probably.
Human Friendly Transmission
A two-stroke, two-cycle, or two-cycle engine is a type of internal combustion engine which completes a power cycle in only one crankshaft revolution and with two strokes, or up and down movements, of the piston in comparison to a "four-stroke engine", which uses four strokes to do so. This is accomplished by the end of the combustion stroke and the beginning of the compression stroke happening simultaneously and performing the intake and exhaust (or scavenging) functions at the same time.
Two-stroke engines often provide high power-to-weight ratio, usually in a narrow range of rotational speeds called the "power band", and, compared to 4-stroke engines, have a greatly reduced number of moving parts, are more compact and significantly lighter.
Internal combustion engine
The Human Friendly Transmission is the name of a proprietary Continuously variable transmission made by Honda for some of its motorcycles. It has been used on the Honda DN-01 and on the EVO6 concept motorcycle.
The electronically controlled automatic transmission system is unlike more familiar belt-driven CVT systems used on scooters, nor does it have a torque converter, typical of automotive applications. Instead it is a hydrostatic drive that employs a variable displacement axial piston pump with a variable-angle swashplate. Apart from Honda, this type of system has not been seen in road-going consumer motor vehicles, though it is familiar in industrial applications and heavy equipment such as forklifts and the US Air Force's MJ-1 bomb lift truck, in use since the 1950s. Honda has also dabbled in this technology since the 1950s. It appeared on their 2001 FourTrax Rubicon 4-wheel, off-road ATV.
The internal combustion engine is an engine in which the combustion of a fuel (normally a fossil fuel) occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine (ICE) the expansion of the high-temperature and high-pressure gases produced by combustion apply direct force to some component of the engine. The force is applied typically to pistons, turbine blades, or a nozzle. This force moves the component over a distance, transforming chemical energy into useful mechanical energy. The first commercially successful internal combustion engine was created by Étienne Lenoir.
The term internal combustion engine usually refers to an engine in which combustion is intermittent, such as the more familiar four-stroke and two-stroke piston engines, along with variants, such as the six-stroke piston engine and the Wankel rotary engine. A second class of internal combustion engines use continuous combustion: gas turbines, jet engines and most rocket engines, each of which are internal combustion engines on the same principle as previously described.
cycle engine oil
A scooter is a motorcycle with step-through frame and a platform for the operator's feet. Elements of scooter design have been present in some of the earliest motorcycles, and motorcycles identifiable as scooters have been made from 1914 or earlier. Scooter development continued in Europe and the United States between the World Wars.
The global popularity of scooters dates from the post-World War II introductions of the Vespa and the Lambretta. These scooters were intended to provide low-power personal transportation (engines from 50 to 250 cc or 3.1 to 15 cu in). The original layout is still widely used in this application. Maxi-scooters, with engines from 250 to 850 cc (15 to 52 cu in) have been developed for Western markets.