ISO ISO Two-Cycle Oil Specifications

During the mid-90s it became clear that the JASO Specifications cannot satisfy the requirements of the modern European two-stroke engines. The ISO standards listed below were developed to address this shortcoming. Their basis is the relevant JASO standard + they require an additional 3h Honda test to be run to quantify piston cleanliness and detergent effect.

Same requirements as JASO FB + test for piston cleanliness.
Same requirements as JASO FC + test for piston cleanliness.
Same requirements as JASO FD + test for piston cleanliness + detergent effect.

Theo Mang, Wilfried Dresel: Lubricants and Lubrication has more on this subject.

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