API CH-4 Class

Section API classes for diesel engines, article 2 of 12156 words, 1 minute

In this section: 12 articles
  1. API CI-4 (CI-4 PLUS) Class
  2. API CH-4 Class
  3. API CG-4 Class
  4. API CF-2 (CF-II) Class
  5. API CF-4 Class
  6. API CF Class
  7. API SE Class: Diesel Engines from 1983
  8. API CD-II Class
  9. API CD Class
  10. API CC Class
  11. API CB Class
  12. API SA Class: Diesel Engines

The class was introduced on December 1, 1998. Engine oils of this class are used in four-stroke diesel engines operating in high-speed regimes and meeting the exhaust-toxicity norms and standards adopted in 1998.

API CH-4 oils meet fairly strict requirements from both American and European diesel-engine manufacturers. The class requirements were specifically developed for engines running on high-quality fuel with a sulphur content of up to 0.5%. At the same time, unlike the API CG-4 class, the service life of these engine oils is less sensitive to diesel fuel with a sulphur content above 0.5%, which matters especially for countries in South America, Asia and Africa.

API CH-4 engine oils meet higher requirements and must contain additives that more effectively prevent valve wear and the formation of deposits on internal surfaces. They can be used as substitutes for API CD, API CE, API CF-4 and API CG-4 engine oils in accordance with the engine manufacturer's recommendations.