Two-stroke oil

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Two-stroke oil (also referred to as two-cycle oil, 2-cycle oil, 2T oil or 2-stroke oil) is an engine oil intended for use in two-stroke engines, like those in many lawnmowers, Outboard motors, mopeds, scooters and small capacity motorcycles, etc. Since these lightweight engines do not feature oil sumps to collect and recycle oil like 4 cycle engines, oil must be mixed with the petrol fuel, for distribution throughout the engine for the purpose of lubrication. The two-stroke oil is ultimately burned along with the fuel resulting in exhaust emissions such as blue smoke and a distinctive odor.

The oil base stock is either petroleum, semi-synthetic or synthetic oil and is mixed with petrol/gasoline with the fuel at a oil ratio ranging from 20:1 to as high as 100:1.

Engine Original equipment manufacturers, (OEM's) introduced pre-injection systems (sometimes known as "auto-lube") to engines to operate from a 32 : 1 to 100 : 1 ratio. Oils must meet or exceed the following typical specifications : TC-W3TM, NMMA, [API] TC, JASO FC, ISO-L-EGO.