5W-40Diesel Engine Oils
RAMCO 5W-40 API CK-4/SN
Fully Synthetic · API CK-4/SN
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Viscosity Grade
SAE 50
Specification
API CF/SF
Category
Mineral
A heavy monograde oil for high-temperature diesel service, transmissions and older commercial engines requiring SAE 50 viscosity.
Additive film guards critical metal surfaces under load.
Resists thermal breakdown across long duty cycles.
Keeps internal components clean and free of sludge.
Maintains film strength in high-temperature operation.
Controlled friction for responsive, quiet running.
| Property | Method | Typical Value |
|---|---|---|
| Density @29.5°C, gm/cc | ASTM D-1298 | 0.892 |
| Viscosity @100°C, cSt | ASTM D-445 | 19.4 |
| Viscosity @40°C, cSt | ASTM D-445 | 218.0 |
| Viscosity Index | ASTM D-2270 | 96 |
| Pour Point, °C | ASTM D-97 | -9 |
| Flash Point, °C | ASTM D-92 | 250 |
| TBN, mgKOH/gm | ASTM D-2896 | 8.6 |
Always refer to the vehicle or equipment manufacturer's recommended specifications before selecting a lubricant.
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