How often should car oil be changed?

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On One Hand: Car Manufacturers' Recommendations

Most auto manufacturers recommend changing the engine oil and filter every 3,000 miles or three months, whichever comes first. The engine oil picks up dirt, metal particles, acids and other contaminants that a filter cannot trap. An oil change removes most of these substances that tend to decrease engine life over time.

On the Other: Exceptions to the Rule

You should consider the circumstances under which you drive your car when deciding how often to change the oil. Car manufacturers say that frequent trailer-towing, stop-and-go driving, driving under dusty conditions and cold weather have a negative impact on oil properties, requiring a shorter service interval.

Bottom Line

How you drive your car may vary throughout the year. The best alternative is to inspect your engine oil level and oil quality, using the dipstick, at least once a month. Follow the instructions in your car owner's manual regarding how to examine oil viscosity and look for signs of contamination.

Source:

"Modern Automotive Technology"; James E. Duffy; 2003

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How often should car oil be changed?

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