What makes high mileage oil

Plus, if your engine contains excessive sludge deposits due to less-than-adequate maintenance practices, this high mileage oil can help by reducing this sludge.

For added protection, consider using a high mileage synthetic or synthetic blend oil rather than a conventional motor oil. Unlike conventional oil, which is simply refined crude oil, synthetic oil is distilled, purified and broken down into its basic molecules. It is then rebuilt and improved with additives formulated to better protect against wear, high heat, cold weather and sludge buildup. This high mileage oil contains seal conditioners to help prevent leaks and control oil consumption.

Keeping your vehicle well maintained and running smoothly is the key to a longer-lasting engine. And as drivers hang on to their aging cars and trucks, perhaps much longer than originally planned, it becomes even more important to give them the care they need.

Click here to update settings. Up Next. Theres more to motor oil than a dipstick. Learn how to check your oil at home and help keep your engine running smoothly, with Firestone Complete Auto Care. Motor oil is motor oil, right?

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Find Store. Find a Different Location Find a Store. Do you want to change your Preferred Store? Yes No. The first is to switch when your vehicle reaches 75, miles. The second is to switch if your older vehicle is beginning to show signs of engine loosening. What makes high-mileage engine oils different?

High-mileage oils have ingredients to take care of older engines, like conditioners, seal swells, antioxidants, detergents and wear or friction additives.

Because this is the only visible benefit of oil specifically designed for older engines, there are brands that only add seal conditioner without addressing any of the other problems older engines face, warns Smith.

GM engineers set high standards for a range of additional factors, including deposit control, piston cleanliness, oil consumption, aeration and oxidation of the oil.

It is critical to hold those contaminants in the oil rather than letting them stick to engine parts because once they settle in place, such gunk acts to create additional contaminants, reports Smith. Detergents, just as they do when washing your laundry, prevent contaminants from depositing on the interior surfaces of the engine.

The problem is that the best such ingredient is phosphorus. Maybe these secret ingredients are the same ones in the anti-wrinkle creams some of us use to fight the human effects of aging! In the old days, drivers would simply switch to a much thicker motor oil to help bridge the large gaps inside worn engines to minimize how much oil slips past piston rings and gets burned in the combustion chamber.

However, modern engines are no place for old-fashioned weight oil. Drivers should always use the oil specified by the manufacturer, advises Smith, even though that is often watery-looking 0W When steel oxidizes you get rust, so we have anti-rust components to combat that.

Even the oil can suffer the petroleum equivalent of rust, he added. It thickens up, so we have antioxidants to combat that so the oil will stay fresh and do its job. The engineered hydrocarbons in synthetic oil are more resistant to breakdown than natural oil is, helping the oil preserve its intended characteristics between oil changes. Find the right motor oil for your engine. An error occurred while submitting your email address to the mailing list.

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