SAE 40 and SAE 50 oils are monograde oils classified according to the SAE (Society of Automotive Engineers) standard. These oils are mostly used in heavy-duty diesel engines, industrial machinery, and hot weather conditions.
Feature | SAE 40 | SAE 50 |
Viscosity | Medium | Top |
Operating temperature | Suitable for high temperatures | Suitable for very high temperatures |
Engine type | Light to medium diesel | Heavy diesel, road construction machinery |
Lubrication at cold start | Weaker | Weaker |
Fuel consumption | A little more | More than SAE 40 |
Note: These oils perform poorly at low temperatures, so they are not recommended for cold climates or for cold starts. Today, multigrade oils such as 15W40 or 20W50 are a good alternative to these grades, as they perform better at different temperatures.
SCC oil is usually an acronym for something like Super Clean Crankcase or, in some brands, is a brand name for heavy-duty diesel engine oils. These oils typically have the following characteristics:
Suitable for turbocharged and non-turbocharged diesel engines
Contains anti-wear, anti-corrosion and cleaning additives
Mineral or semi-synthetic base
With API standards such as CF, CH-4 or CI-4
Some companies use the term SCC for oils that are specifically designed for industrial engines, generators, ships, or road construction machinery. These oils are usually manufactured in SAE 40 or SAE 50 grades and are designed for severe operating conditions.
Climatic conditions: In hot areas, high-viscosity oils such as SAE 50 perform better.
Engine type: Heavy-duty diesel engines require oils with high pressure resistance.
Quality standards: Pay attention to API, ACEA, and viscosity grade.
Oil change interval: Oils with more additives usually last longer.
