![]() This happens because the larger the molecules are, the more they inhibit the oil’s flow. The hotter it gets, the more these molecules expand and increase the viscosity. They are polymeric molecules and change depending on the temperature. Viscosity modifiers are also known as VI (Viscosity Index) improvers. Still, it’s much less expensive in the long run and, in almost every case, much better for your vehicle. They’ll also need changing more often since the viscosity modifiers get chopped up by the engine. In exchange, multi-grade engine oils are more expensive. Potentially improved performance at high temperatures.Improved fuel economy throughout the year.Less strain on the battery when cold starting.Here are a few more benefits of multi-grade oils: The same oil can function well in both the cold and the hot. Multi-grade oils mean this is a thing of the past. They required winter oil (which was thinner, so the vehicle could start) and summer oil (which was thicker to better deal with the higher temperatures). Until around 60 years ago, cars needed new engine oil at least twice per year. Most significantly, it saves changing your oil twice a year. We need multi-grade engine oils for many reasons. They aim to create a lubricant as “thin” as possible when cold and as “thick” as possible when hot. These force its viscosity to behave differently relative to the temperature. Multi-grade engine oil contains additives. The only exception might be in hot climates where freezing temperatures are infrequent. You’ll probably be familiar with these, as today they’re by far the most common on sale – and with good reason. What Is Multi-Grade Engine Oil?ĠW-20 and 5W-20 are examples of multi-grade oil (also sometimes spelled “multigrade”). For example, SAE 10 is less viscous than SAE 20, so it flows easier. We can take the same concept to engine oils. This is because it’s less viscous than the custard. If you put an equal quantity of each in separate pitchers, you can visualize how water pours easier. The “thicker” a liquid is – the more it resists its own flow – the more viscous it is.įor example, consider the difference between custard and water. A more in-depth scientific explanation is the frictional resistance a fluid has to its flow. In simple terms, it’s how “thick” a liquid is, as mentioned before. Viscosity is an important concept to grasp before delving into the concepts of multi-grade oils like 0W-20 and 5W-20. The oil pump then forces the liquid through the channels to lubricate the moving metal parts. This is a sort of oil container usually bolted underneath the engine. When you put new oil into the car, it drips down into the sump. You’ll need to top it up regularly since cars naturally burn off a limited quantity over time. Use the dipstick to check the oil (on flat ground with the engine off) every month or every couple of thousand miles. It doesn’t have to be on the MAX, contrary to what some tell you. The level shown should be between the minimum and maximum marks. You’ll be familiar with the standard way to check engine oil levels: the dipstick. These include gasoline, kerosene, and diesel. Other things are created through the same process. It’s one of many products distilled from raw crude oil. ![]() It keeps the moving metal parts in smooth motion by creating a cushion between the surfaces. Engine oil comes in several forms, such as fully synthetic or high mileage, and lubricates your engine.
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