How Often Should You Change Your Oil?

Few maintenance questions get asked more often than this one: how often should you actually change your oil? The old "every 3,000 miles" rule is still repeated everywhere, but modern engines and modern oils have moved well past it. Here's what really matters for your vehicle.

The short answer

For most modern vehicles, the right interval falls between 5,000 and 7,500 miles on conventional oil, and 7,500 to 10,000 miles (sometimes more) on full synthetic. The single most reliable source is your owner's manual — manufacturers test their own engines and publish the interval that keeps your warranty valid.

That said, mileage is only half the story. Time and driving conditions matter just as much, which is why two identical cars can need very different schedules.

Conventional vs. synthetic oil

Conventional oil is refined from crude and breaks down faster under heat. It's the most affordable option and works fine for older engines and light drivers, but it needs changing more often.

Full synthetic oil is engineered for stability. It resists heat, flows better when cold, and keeps your engine cleaner for longer — which is why most newer vehicles now require it. Synthetic blends sit in between on both price and protection.

• Conventional: roughly every 5,000 miles
• Synthetic blend: roughly every 6,000–7,500 miles
• Full synthetic: roughly every 7,500–10,000 miles

Why "severe" driving shortens the interval

Most manufacturers publish a "severe service" schedule, and far more drivers fall into it than realize. Here in the San Fernando Valley, summer heat and stop-and-go traffic on the 5 and the 170 are textbook severe conditions. You likely drive severe if you:

• Take lots of short trips under 10 miles
• Sit in heavy stop-and-go traffic regularly
• Drive in extreme heat (hello, Sun Valley summers)
• Tow, haul, or carry heavy loads
• Drive on dusty or unpaved roads

If that's you, lean toward the shorter end of your oil's range.

Signs you're overdue for an oil change

• Dark, gritty oil on the dipstick instead of amber and smooth
• An oil change or check-engine light on the dash
• A ticking or knocking noise from the engine
• A burnt-oil smell inside or around the car
• Reduced fuel economy

Don't wait for these. Old oil loses its ability to lubricate and cool, and running an engine on degraded oil is one of the fastest ways to cause expensive internal wear.

Don't forget the oil filter

Your oil filter traps the debris your oil picks up. A clogged filter can restrict flow and let unfiltered oil circulate. We replace the filter with every oil change — it's a small part that protects a very expensive one.

Whatever the cause, the team at A Plus Auto Shop can help. Learn more about our oil change and tune-up service, or call us at (818) 500-1939 — walk-ins are always welcome at our Sun Valley shop.

Frequently Asked Questions

Is the 3,000-mile rule still true?

For most vehicles built in the last 15 years, no. It's a holdover from older engines and conventional oils. Modern engines on synthetic oil routinely go 7,500–10,000 miles. Check your owner's manual for your specific interval.

How often should I change oil if I barely drive?

Oil degrades with time as well as mileage. If you drive very little, change your oil at least once or twice a year even if you haven't hit the mileage limit.

Can I switch from conventional to synthetic oil?

Yes. Switching to synthetic is safe for virtually all engines and usually beneficial. There's no truth to the myth that you can't go back to conventional afterward.

How much does an oil change cost?

It depends on your vehicle and the oil type it requires. Synthetic oil costs more than conventional. We give you the price up front — call (818) 500-1939 for a quote.