Lower Oil Viscosities

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Why are oil viscosities getting thinner? Is that good for the engine? Will it do the same job?

These are common questions that we hear from customers and want to take a minute to address these concerns.

25 years ago, the most common viscosity grades were 10w30, 10w40, and 20w50 for passenger cars and light trucks, and 15w40 for heavy duty diesel engines. Today, the requirements of vehicles and oil have led to thinner viscosity grades being preferred by manufacturers. In passenger cars and light trucks, we are seeing viscosity grades as low as 0w16, with 0w20, 5w20, and 5w30 being the most common. Heavy duty diesel is most commonly filled with 10w30 now, with 5w40 and 5w30 also becoming more common.

Why thinner viscosities?

Fuel Mileage. Manufacturers have had to find ways to increase fuel efficiency and meet standards put in place by government regulations. So how does thinner viscosity engine oil help with fuel mileage? Imagine trying to walk through a pool filled with molasses versus a pool filled with water. It would take more energy to walk through the pool of molasses. The same is true for thicker viscosity oil. It takes more energy, which means more fuel, to make engine parts move through thicker oils. Lower viscosity oil engine oils take less energy, which means better fuel efficiency.

Engine Protection. How does thinner oil protect better? Engines today are designed taller and thinner than engines of the past. This means it is further from the oil pan to the top of the engine and takes longer for the oil to reach the top of the engine at start up. After your engine has stopped running, all the oil drains back down to the oil pan and sits waiting for the engine to start again. When the engine starts again, the oil must quickly be pumped by the oil pump back to the top of the engine to get everything lubricated and prevent wear. Thinner viscosity oils allow for faster lubrication from top to bottom to keep the effects of dry starts to a minimum.

Engine Component Life. Lighter viscosity oils also create less stress on other components, extending their life. The oil pump has an easier time moving oil throughout the engine. The oil gets pumped throughout the engine quicker, making startups easier on the starter and using less energy from the battery. All of this and more leads to extended component life.

These are just a few reasons why there has been a move in the industry to lighter viscosity engine oils. Rest assured, engine oils today are made tougher and tested to meet the most rigorous standards to ensure you get the most protection. Always consult your owner’s

manual and know that we are here to help you make the best decision on what to use to keep your equipment performing at its best.

When choosing a product, always bet on a reputable product from a distributor that has your best interest in mind. We believe in providing quality products and service, while putting our customers’ needs first. And that is why “Sutton Sense Makes Cents” for your business.

Author: Mack Wiard