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Lubricant Oils Information

It main function of lubricant oil is to lubricate every moving part of your engine or machine with a protective film that reduce friction.

If the lubricant oil has at least four other duties, and failure to perform them all can seriously reduce the performance and life of your engine or machine.

The lubricant oil can clean your engine. Gasoline and diesel engines can produce soot, ash, acids, and moisture which from sludge, varnish, and resins. If they collect on critical engine parts, it means serious trouble. A quality of lubricant oil keeps them suspended until filtered out or drained away when you change your oil.

Next, oil seals microscopic hills and valleys on piston rings and cylinder walls. Without proper sealing action, you'll lose power and waste fuel.

The lubricant oil also protects your engine against rust and corrosion.

Finally, oil cools vital parts such as camshaft, rods, pistons that the engine coolant in your radiator cannot reach. As much as 40% of the cooling job in your engine is performed by the oil in your crankcase.


SAE (Society of Automotive Engineer)

Detailed information about the quality of your engine oil is contained in the API and SAE

Which API stands for America Petroleum Institute.

SAE is referred to viscosity grade (e.g. SAE 5W-40). Viscosity is a measure of the oil's flow charateristics at certain temperatures. The first number/letter combination (e.g. 5W) indicates how well the oil will flow to lurbricate critical engine parts in low temperatures. The lower this number, the more easily the oil will help your engine to start in cold weather, especially in winter time.

The second number (e.g. 40) indicates the oil's ability to lubricate the engine at high temperatures. In this case, the higher the number the thicker the oil. A multi-grade oil, SAE 5W-40 in this example, satisfies the requirements of both cold and start and high temperature viscosity grades.

Here's a description of the five most common SAE multi-grade lubricant oils:-

SAE Description
0W-30 Premium winter grade oil. Provides year-round protection and fuel economy. Can be used where SAE 5W-40 is recommended.
5W-40 Premium multi-grade oil for easier cold-weather starts, maximum protection, excellent fuel economy and added engine life. The preferred grade for most cars built after 1989
10W-40 The best selling premium mulit-grade in Malaysia. Delivers excellent all-round performance for the average driver.
15W-40 A premium multi-grade oil for hotter-than-normal running conditions. May provide extended engine life under high temperature conditions.
20W-50 Thicker premium mulit-grade oil for added protection against metal-to-metal contact; specially formulated to meet the needs of high performance European engines.

Guide to SAE viscosity grade of engine oils shown below:-

If lower expected outdoor temperature is Typical SAE viscosity grades is recommended
0°C (320°F) 5W-20, 5W-30, 5W-40, 10W-30, 10W-40, 20W-50
-18°C (0°F) 5W-20, 5W-30, 5W-40, 10W-30, 10W-40
Below -18°C (0°F) 5W-20, 5W-30, 5W-40

Multigrade oils such as SAE 5W-30 or 5W-40 and 10W-30 or 10W-40 are widely used because under all but extremely hot or cold conditions, they are thin enough to flow at low temperature and thick enough to perform satisfactorily at high temperature.

Note that vehicle requirements may vary. Follow your vehicle manufacturer's recommendation on SAE oil viscosity grade. Using the right and appropriate grade of lubricant oil will help you acheive total protection and reduce maintenance cost.

You may search any respective product with its registered API and SAE information from the EOLCS License Directory to ensure you are getting the quality product from your suppliers and eliminate counterfeit product.

For more understanding about SAE, you may send your enquiry to [email protected]





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