Current Trends of Passenger Car Gasoline Engine Oils in Japan - Report by JASO Engine Oil Subcommittee

Engines in Japan have higher output versus small displacement (bhp/liter) and require low phosphorus content in the engine oils to meet the most stringent exhaust emission regulation in the world.

The market survey of typical API SF oils in Japan showed that the average phosphorus content was approximately 0.07 %. Under such circumstances engine oils provide good performance with the usage of secondary zinc di-alkyldithiophosphates (Zn DTP) for valve train wear protection, addition of friction modifiers for fuel economy, etc.