API (American Petroleum Institute) service categories
API (American Petroleum Institute) service categories classify
oil quality according to the severity of engine usage conditions
as set by the API.
Gasoline engine oil categories are divided into 11 categories
from SA to SM, and diesel engine oil categories is divided into
10 categories from CA to CI4.
Search by category
- Engine overview
- Engine structure
- Principles of engine operation
- Fuel, oil, and water
- Emission regulations
- Engine performance
- Engine combustion
- Diesel engine structure
- Gasoline engine structure
- Diesel fuel system
- Water
- Valve mechanism
- Cooling system
- Cylinder related
- Fuel system
- Electrical component
- Lubrication system
- Aftertreatment device
- Kubota Engine
- Oil
- Intake/exhaust system
- Exhaust gas recirculation system
- Common rail system
- Mechanical governor
- Starter
- Power generation system
- Ignition system
- Fuel
- DPF system
- Exhaust gas purification