How to change Oil for you car in 2020

I’m not sure what I thought would happen if I didn’t, but I vaguely imagined an unlubricated engine grinding to a halt.

Childhood habits are hard to undo, and that’s often good. To this day, I hate seeing an empty room with the lights on.

But sometimes, we need to throw aside our parents’ good advice. In March, for example, I wrote about how we should relearn the dishwasher and laundry soap habits we inherited from our mothers.

Add frequent oil-changing to that list.

“There was a time when the 3,000 miles was a good guideline,” said Philip Reed, senior consumer advice editor for the car site Edmunds.com. “But it’s no longer true for any car bought in the last seven or eight years.”

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The California Integrated Waste Management Board ran public service announcements for several years about “the 3,000-mile myth,” urging drivers to wait longer between oil changes. Although the information is a few years old, the board has a list of cars on its Web site and how often they need oil changes. The concern is not only the cost to drivers, but the environmental impact of throwing away good oil, said Mark Oldfield, a recycling specialist for the agency.

But the situation is not that clear cut, according to Robert Sutherland, a Pennzoil scientist who works at Shell Global Solutions.

Rather than picking a number, Mr. Sutherland said, he recommends following what your owner’s manual advises. I checked the manual for our 2007 Mazda5 and had to determine if my typical driving included a lot of stop-and-go driving, short distances, extended idling, muddy, rough or dusty roads or really humid or cold temperatures.

Hmm. Yes, to short distance and stop and go. So that meant I should get the oil changed every 5,000 miles. If I did a great deal of longer-distance highway driving, it would be every 7,500.

The different types of driving are usually known as severe and mild (which is also sometimes called normal), Mr. Sutherland said, which seems counterintuitive since most of us probably don’t think we drive in severe conditions. But we do.

The reason, he said, is that if you take a trip of less than 10 miles or so, the engine and the oil are not completely warmed up. And if the oil is still cool, he said, it cannot absorb the contaminants that come from internal combustion as efficiently.

“It’s designed to work best when fully warmed up,” Mr. Sutherland said. “If you’re running to the music lesson, to school, the gym, that’s severe driving conditions.”

Mr. Sutherland said he has a mild commute. “It’s 47 miles, all highway.”

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What actually happens if you don’t change your oil? Well, it doesn’t run out, it simply gets dirtier and dirtier. It’s like mopping the floor with a bucket of water and detergent. The water starts out clean, but the more you use it, the filthier it gets. Eventually, you’re making the floor dirtier if you don’t change the water.

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