United DH-2 is a high-performance advanced engine oil that meets the Society of Automotive Engineers of Japan (JSAE) automotive diesel engine oil standard, JASO DH-2. United DH-2 is optimally formulated for new low-emission engines running on Ultra Low Sulfur Diesel (ULSD) fuel and is also backwards compatible with earlier API oil service categories.

United DH-2 applies to Japanese-made diesel engines with after-treatment devices such as Diesel Particulate Filters (DPFs) and catalysts that comply with up-to-date exhaust emission regulations.