• SUMICO'S Engine Oils

The following engine oil classifications are set by the API （American Petroleum Institute） .

【API Service for Gasoline Engine Oils】

Item	SH	SJ	SL	SM	SN
Oxidation stability	☆	☆	☆☆	☆☆☆☆	☆☆☆☆
Anti-sludge performance	☆	☆	☆☆	☆☆	☆☆☆☆
Wear resistance of variable valve train system	☆	☆	☆☆	☆☆☆	☆☆☆☆
Rust prevention performance	☆☆	☆☆	☆☆	☆☆	☆☆
Low volatility performance	☆	☆☆	☆☆☆☆	☆☆☆☆	☆☆☆☆
Shear stability	☆	☆	☆	☆	☆
Deposit control at high temperature	☆	☆☆	☆☆☆	☆☆☆☆	☆☆☆☆
Compatibility with oil seal	☆	☆	☆	☆	☆☆
Compatibility with exhaust catalyst	☆☆	☆☆☆	☆☆☆	☆☆☆☆	☆☆☆☆
Anti-foaming performance	☆☆	☆☆☆	☆☆☆☆	☆☆☆☆	☆☆☆☆
Cold startability	☆	☆☆	☆☆	☆☆	☆☆
Filterability	☆☆	☆☆	☆☆	☆☆	☆☆
☆marks in total	16	21	28	33	37

【API Service for Diesel Engine Oils】

• SUMICO'S Gear Oils

Item	CC	CD	CE	CF	CF-4
Piston cleaning efficiency	☆	☆	☆☆	☆☆☆	☆☆☆
Soot dispersion capability		☆	☆	☆	☆☆☆
Wear resistance		☆	☆	☆	☆☆
Rust prevention performance	☆	☆	☆	☆	☆
Low volatility performance	☆	☆	☆	☆	☆☆
Shear stability	☆	☆	☆	☆	☆
Compatibility with oil seal	☆	☆	☆	☆	☆
Anti-foaming performance	☆	☆	☆	☆	☆
☆marks in total	6	8	9	10	14

【API Service for Gear Oils】

GL-1	Spiral bevel gear, worm gear and manual transmission with low face pressure and low sliding velocity.
GL-2	Worm gear, not applicable to GL-1 because of requirements such as load, temperature and sliding velocity.
GL-3	Manual transmission and spiral bevel gear having mid-range sliding velocity and loading conditions.
GL-4	Gears of vehicles, especially Hypoid gear, operated under high speed & low torque or low speed & high torque conditions.
GL-5	Gears of vehicles, especially Hypoid gear, operated under high speed & impact load, high speed & low torque or low speed & high torque conditions.

↑Higher numbers followed after GL do not necessarily mean high quality products.