What Are The Oil Grading Types?

Engine Oil Grading

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November 26th, 2015

Premium Conventional Oil: This is the standard new-car oil. All leading brands have one for service level SL, available in several viscosities. The carmakers usually specify a 5W-20 or 5W-30 oil, particularly for lower temperatures, with a 10W-30 oil as optional, particularly for higher ambient temperatures. These three ratings cover just about every light-duty vehicle on the road. Even more important, though, is changing the oil and filter regularly. A 6,000 kilometers /4 months interval is good practice. The absolute minimum is twice a year. If your car has an electronic oil-change indicator on the instrument cluster, don’t exceed its warning.

Full Synthetic Oil: The oils made for high-tech engines, whether in a Chevy Corvette or Mercedes-Benz, are full synthetics. If these oils pass stringent special tests (indicated by their labeling), it means they have superior, longer-lasting performance in all the critical areas, from viscosity index to protection against deposits. They flow better at low temperatures and maintain peak lubricity at high temperatures. So why shouldn’t everyone use them? Answer: These oils are expensive and not every engine needs them. In fact, there may be some features that your car’s engine needs that the synthetics don’t have. Again, follow your owner’s manual.

Synthetic Blend Oil: These have a dose of synthetic oil mixed with organic oil, and overall are formulated to provide protection for somewhat heavier loads and high temperatures. This generally means they’re less volatile, so they evaporate far less, which reduces oil loss (and increases fuel economy). They’re popular with drivers of pickups/SUVs who want the high-load protection. And they’re a lot less expensive than full synthetics, maybe just pennies more than a premium conventional oil.

Higher Mileage Oil: Today’s vehicles last longer, and if you like the idea of paying off the car and running the mileage well into six figures, you have another oil choice, those formulated for higher-mileage vehicles. Almost two-thirds of the vehicles on the road have more than 120,000 kilometers  on the odometer. So the oil refiners have identified this as an area of customer interest, and have new oils they’re recommending for these vehicles.

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