API Two-Stroke Engine Oil Classification (American Petroleum Institute)

1) Oil classes of two-stroke air cooled engines: TA, TB and TC.
2) Two-stroke boat engines - TD.
The further the second letter of the alphabet, the higher the oil.

JASO Two-Stroke Engine Oil Classification (Japanese Automobile Standards Organization)
Oil classes for two-stroke engines: FA, FB and FC.
The further the second letter of the specification, the higher the oil in the alphabet.

ISO 2-Stroke Engine Oil Classification
(Classification is mainly based on JASO specifications.)
Engine oil grades: E-GB, E-GC and E-GD.
The further the third letter of the specification, the higher the oil in the alphabet.

NMMA Two-Stroke Engine Oil Classification (National Marine Manufacture Association)
Two-stroke engine oil standard for outboard motors: TC-W3.

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