DH-1

JASO DH‑1 specification is a Japanese technical standard that defines the requirements for engine oils for high‑power diesel engines, particularly for heavy‑duty truck and bus units, as well as for passenger diesel vehicles operating under severe service conditions. According to this standard, the oil must provide minimum viscosity at high temperatures, high oxidation resistance, excellent wear and corrosion protection, and also meet HTHS requirements (no less than 3.5 mPa·s at 150 °C). A distinctive feature of DH‑1 is the limitation of sulfates, phosphorus and metallic residues (SAPS), which makes such oil compatible with emission after‑treatment systems—catalysts and soot filters (DPF/FAP). Therefore, XENUM products bearing the DH‑1 mark are suitable for engines certified to API CJ‑4/CK‑4, as well as for Japanese models where manufacturers require JASO DH‑1, ensuring long‑lasting combustion‑chamber cleanliness and stable performance under load. When selecting oil on xenum.ua you immediately see the JASO DH‑1 marking, simplifying the choice of the appropriate product, for example XENUM DIESEL POWER 10W40 E7, which meets these requirements.