What does two-stroke oil mean?

[LeilaAnn]

So-called two-stroke refers to a two-stroke internal combustion engine, and two-stroke oil means the engine oil used in two-stroke internal combustion engines. The following are specific explanations about two-stroke engines: 1. Definition: It completes one power cycle every two strokes, hence the name two-stroke. 2. Advantages: Simple structure, compact size, light weight, low cost; smooth operation with minimal vibration; rapid acceleration over short distances. 3. Fuel consumption: In two-stroke engines, the intake and exhaust processes only occupy 130°~150° of crankshaft rotation. Fresh air-fuel mixture first enters the crankcase. When the piston moves downward, the fresh mixture enters the combustion chamber through the scavenging port while pushing out residual exhaust gases through the exhaust port. To ensure more thorough exhaust gas expulsion, some fresh mixture inevitably escapes with the exhaust gases, resulting in wastage of fresh mixture and increased fuel consumption.