Does motor oil degrade over time?

Over time, petroleum-based oils will degrade or break down from the heat and pressure inside the engine. As this occurs, the chemical composition of the oil changes and it becomes contaminated. After thousands of miles, petroleum-based oils are unable to protect the engine and must be replaced.

Does engine oil degrade if not used?

But to summarize, oil does not “spoil”, and non-use certainly doesn’t sever the long chain molecules. Yes, moisture that accumulates from combustion by-products should be vaporized off once in a while, but oil is not hygroscopic, and extended storage will not add bad things.

How long does it take motor oil to degrade?

Well, the oil mostly comes with a five-year shelf life. All the same, if your oil container indicates a shelf-life less than five years, you should work with the printed dates.

Can engine oil last 2 years?

Unused, unopened and stored in its original container out of extremes of temperature, motor oil will last for an “extended period”. They then go on to suggest that the oil shouldn’t be used after a few years; the exact period varying between 2 years (according to Total) up to 5 years (Mobil).

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How often do you need to change your oil if you don’t drive much?

It’s not just about miles: If you don’t drive your car a lot, your oil still needs to be kept fresh. Even if you drive fewer miles each year than your automaker suggests changing the oil (say, 6,000 miles, with suggested oil-change intervals at 7,500 miles), you should still be getting that oil changed twice a year.

Does engine oil go bad after 6 months?

Motor oil, in sealed containers should be used within 3 or 4 years, but even at 10 it is fine if kept in a relatively dry room. The remains of oil in an opened container will also be fine for 6–12 months, although the longer, or the more times opened to use a little, the darker it will get from oxidation.

How long is motor oil good for after opening?

A reader asks: How long is motor oil usable after the bottle has been opened? Our answer: Once the seal has been cracked on a bottle of motor oil, the remaining oil should be used up within one year.

What happens if you go too long without an oil change?

Go long enough without an oil change, and it could eventually cost you your car. Once motor oil becomes sludge, it no longer draws heat from the engine. The engine might overheat and either blow a gasket or seize up. … If the heat doesn’t cause a gasket to blow, it will warp the parts in your engine.

How often should you change your oil in months?

The general recommendation is to change your oil every 3,000 to 5,000 miles or every three to six months, with twice a year being the minimum.

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Is it bad to go 1000 miles over an oil change?

Keep in mind, though, that most manufacturers recommend getting an oil change twice a year no matter how many miles you’ve driven. That’s right—even if you’ve only driven 1,000 miles since your last oil change, you still need to get an oil change every six months.

Why have I not changed my oil in 2 years?

It is recommended to get your oil changed at least twice a year, even if you haven’t driven those thousands of miles that are normally recommended. … Bad oil could cause any number of costly issues, so if it has been six or so months and you haven’t had your oil changed, make an appointment today.

Can you really go 10000 miles with synthetic oil?

Full synthetic oils will actually last well beyond 10,000 miles. The lifespan of synthetic oil depends, but it’s not crazy to see oils still working at 15,000 miles or longer. … Our standard recommendation is 7,500 miles for a normal vehicle based on the thousands of engine repairs we’ve seen over the years.