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You need an oil change every so often, but do you know why? Despite its status as a routine service, the oil change isn't a top-of-mind item for most drivers on an average day. That's by design. Modern vehicles are convenient in many ways, so you don't need to know too much about their inner workings to keep them running. However, you might find yourself curious about the why and how of your vehicle and its parts on occasion. Today, let's examine the oil change.
What does motor oil do?
Motor oil protects the engine. Specifically, it provides lubrication for the many moving parts of the engine. Without this lubrication, friction would cause wear and damage to these parts. In addition, motor oil carries contaminants to the oil filter (more on that below). This helps keep the engine clean. As it moves, oil also carries heat away from the engine, aiding in temperature control. Finally, many oil brands include additives that protect your engine. For example, engine oils with corrosion resistance.
How does oil become dirty?
Oil collects contaminants as it flows, but how do they get there in the first place? The answer varies on the debris. One contaminant comes from the engine and its parts. Over time, tiny bits of metal break away from friction (even the best oil can't prevent this completely). Although the oil filter catches some bits, others are small enough to slip by with the oil. As you drive, your vehicle also creates by-products from fuel, such as ash. Oil collects this residue, but it may also escape the filter. Even dust and outdoor debris can make their way to the oil since the engine isn't completely sealed off.
Oil also darkens over time from oxidation and exposure to the engine's heat. It becomes less effective and eventually requires replacement with fresh lubricant.
What happens if I never change my oil?
Sludge. Search images of "engine sludge"; and you'll never want to miss an oil change again.
Over time, oil molecules break down and can combine with deposits and water to create a sticky, lumpy sludge that clogs the engine. So the next time you're thinking about skipping an oil change, think again.
When do you need an oil change?
Oil change intervals vary depending on the type of engine oil you use and have evolved over time. For example, 2,000 miles was once the average, recommended oil change interval. Eventually, that became 3,000 miles as formulas improved. Today, recommended intervals range between 3,000 to upwards of 10,000 miles depending on your vehicle, the type of oil you use, and how frequently you drive. Some manufacturers may also suggest changing oil based on time, such as every 6 months or year. Review your owner's manual to learn the specifics for your vehicle or contact us and we'll be happy to assist you.
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