The frequency of changing engine oil depends on several factors, including the type of vehicle, driving conditions, and the type of oil used. Here's a general guideline:

[HEADING=2][B]1. Follow Manufacturer Recommendations[/B][/HEADING]
[LIST]
[*]Check your vehicle's owner's manual for the manufacturer's suggested oil change interval.
[*]Modern vehicles often recommend intervals of [B]5,000 to 10,000 miles[/B] (8,000 to 16,000 kilometers) or [B]6 to 12 months[/B], depending on the oil type and vehicle.
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[HEADING=2][B]2. Consider the Type of Oil[/B][/HEADING]
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[*][B]Conventional Oil:[/B] Usually requires changes every [B]3,000 to 5,000 miles[/B] (4,800 to 8,000 kilometers).
[*][B]Synthetic Oil:[/B] Typically lasts [B]7,500 to 10,000 miles[/B] (12,000 to 16,000 kilometers), or even more for some premium synthetic oils.
[*][B]Synthetic Blend:[/B] Falls somewhere between conventional and full synthetic in terms of longevity.
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[HEADING=2][B]3. Driving Conditions[/B][/HEADING]
Frequent oil changes may be necessary if you:

[LIST]
[*]Drive in extreme temperatures (very hot or cold).
[*]Tow heavy loads or drive in hilly terrain.
[*]Drive mostly in stop-and-go traffic or make short trips (which don't allow the engine to fully warm up).
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In these cases, consider following the "severe driving" maintenance schedule from your owner's manual.

[HEADING=2][B]4. Monitor Oil Life Indicators[/B][/HEADING]
Many modern cars have built-in oil life monitoring systems that analyze driving conditions and notify you when it’s time for an oil change.

[HEADING=2][B]5. Perform Regular Checks[/B][/HEADING]
Check the oil level and condition every month. If the oil appears dark or gritty or the level is low, it might be time for a change.

[HEADING=2][B]Rule of Thumb[/B][/HEADING]
For older cars or those without advanced monitoring systems, changing the oil every [B]3,000 to 5,000 miles[/B] is a safe approach. For newer vehicles, follow the manufacturer’s recommendations or the oil life monitor.