Addition of New DH-2F and DL-0 Categories of Automotive Diesel Engine Oil Standards and Revision of Application Manual
On March 17, 2017, the Society of Automotive Engineers of Japan, Inc. (JSAE) revised its automotive diesel engine oil standards to include the new DH-2F category for heavy-duty vehicles and the new DL-0 category for light-duty vehicles (see JASO1 M355: 2017).
The DH-2F category for trucks and buses introduces fuel economy requirements to the requirements stipulated in the existing DH-2 category, and the DL-0 category for passenger cars and light commercial vehicles is intended to serve as an alternative to the obsoleted CF-4 standard of the American Petroleum Institute (API).
In response, the JASO Engine Oil Standards Implementation Panel2—whose membership includes representatives of the Japan Automobile Manufacturers Association, Inc. (JAMA) and the Petroleum Association of Japan—revised its Automotive Diesel Engine Oil Standard Application Manual to incorporate these additions.
The DH-2F Standard
Fuel efficiency targets for heavy-duty vehicles were first introduced in Japan in 2006 for compliance by 2015, and new targets are currently under study. In addition to pursuing greater vehicle fuel efficiency, Japan’s heavy-duty vehicle manufacturers also promote the development of fuel-saving diesel engine oils. At JAMA’s request, JSAE has carried out groundbreaking work in developing and introducing heavy-duty engine test standards for fuel-saving diesel engine oil (JASO M362:2017). The JASO test method makes it possible to measure the fuel consumption performance of engine oil in both new and in-use heavy-duty vehicles by simulating real-world vehicle operation.
The DL-0 Standard
The API CF-4 standard was obsoleted in 2008, but in Southeast Asia and other markets where Euro 4 or earlier emission regulations are still in application, there has been a continuing need, for passenger cars and light commercial vehicles, for engine oils that meet the performance and quality requirements of API’s obsolete CF-4 standard. Spurred by a request from JAMA, JSAE developed the DL-0 standard as a replacement for the CF-4 standard.
Revision of the Application Manual
In the latest revision to the JASO Engine Oil Standards Implementation Panel’s Automotive Diesel Engine Oil Standard Application Manual, the principal new elements introduced through the addition of the new DH-2F and DL-0 categories to the existing DH-1, DH-2 and DL-1 categories pertain to the notification and display methods, based on the assumption that a single oil type will be reported under multiple categories. (For details, see the main text of the Application Manual posted on the website of the Japan Lubricating Oil Society at http://www.jalos.or.jp/index.html.)
1 JASO: The Japanese Automotive Standards Organization; automotive standards are, however, determined by JSAE.
2 JASO Engine Oil Standards Implementation Panel: Established by industry groups, academic institutes and other entities concerned with automotive engine oil in Japan to promote the correct application of Japan’s engine oil standards domestically and abroad.