Do thinner oils improve fuel efficiency?

Technically, yes, as thin oil flows through the engine with less resistance than thicker oil. Some dedicated “hypermilers” — drivers who treat getting the best possible mileage almost as a game — insist it makes a small difference, usually less than a half-mile per gallon.

Can thin oils effectively protect an engine?

Fuel-efficient engine oil

To prevent fuel consumption due to excessive fluid friction, automobile manufacturers (OEMs) strive to use even thinner engine oils. … The lower the viscosity of an engine oil, the more important the chemical protection of the engine becomes.

Does thicker oil increase fuel consumption?

The thicker that oil is, the more energy it takes to pump that oil, which uses fuel. Just like people may take blood thinner to make it easier on their heart to pump it, it’s the same with engine oil.

Is thinner oil better for engine?

Since motor oil with a lower viscosity (e.g., 5W-20) is thinner, it flows better than motor oil with a higher viscosity (e.g., 20W-50) that is much thicker. … In other words, your car will probably take a long time to start (if it even starts) at freezing temperatures, if you use the motor oil with the wrong viscosity.

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Does thicker oil reduce oil consumption?

In some cases, using a higher viscosity motor oil can help fill the widening gap between the rings and cylinder wall, reducing oil consumption. Some vehicle manufacturers recommend multiple oil viscosities based on climate, such as 5W-20 in colder weather and 10W-30 in warm climates.

Is 0w20 better than 5w30?

0W-20 OIL. … It readily means that the 0 oil will flow well and better at a cold temperature more than 5W-30 oils even while maintaining the same viscosity. The 0W-20 is said to be the best oil in the market because it helps to reduce environment hassle on waste oil disposal.

Why do modern engines use thin oil?

Thinner oils are being used these days for three reasons: They save fuel in test engines, the viscosity rules have changed, and manufacturers are recommending thinner grades. The Sequence VI-B is the test used to evaluate fuel economy for the GF-3 specification.

Which is better 5w30 or 10W40?

The difference is in the viscosity of each at different temperatures. … The 5w30 oil will flow better at low temperatures than the 10w40 oil. This means that the 5w30 oil will protect the engine better at low temperatures, usually when the engine is just starting or during weather conditions such as winter.

Which oil is better 10W30 or 10W40?

Between a 10W-30 and 10W-40, 10W30 motor oil would run smoother in colder climates while a 10W40 would be more effective in preventing engine wear and tear in warmer temperatures.

Will thicker oil damage my engine?

Not only that, but the engine will waste energy pumping the thicker motor oil, reducing fuel economy. Since thicker oils don’t transfer heat as well as thinner oils, operating temperatures will increase, too, possibly leading to accelerated chemical break down and harmful sludge and deposits.

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Is it better to use thicker oil in older engines?

Newer vehicles can utilize thinner oils for faster lubrication of new engine parts. In contrast, older, high-mileage engines benefit from thicker oils to prevent friction and oil loss.

Can I use 10W 40 instead of 5w30?

Your vehicle does not use 5W-30 oil. The recommended oil viscosity for your vehicle, according to Kia documentation, is 10W-40. If you drive the vehicle in exceptionally cold weather, well below 32 degrees, you can use 5W-30 oil but even 10W-40 is still perfectly OK to use if outdoor temperatures are below freezing.

Does oil get thicker or thinner when hot?

Motor oil includes additives developed to reduce changes in viscosity because of temperature. Certain motor oils are designed to be thinner (less viscous) when cold and more viscous (thicker) when hot.

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