How often should I change my oil?

Follow the oil-life monitor or the owner's manual. Modern engines on synthetic commonly run 7,500–10,000 miles between changes — the old 3,000-mile rule is outdated for most cars. Short trips, towing, and extreme temperatures count as severe service and shorten the interval.

Conventional or synthetic — does it matter?

Use whatever spec the manual requires; many modern engines require synthetic, and conventional will not protect them. Switching an older car to synthetic is fine, and switching back is fine too — the old warning about leaks was a myth.

Where does the old oil go?

Parts stores and municipal recycling sites take used oil free — pour it back into the empty jugs with the funnel. Never dump it: one quart of oil can contaminate 250,000 gallons of water. The drained filter can usually be recycled too — ask at the counter.

What if the drain plug is stuck or starts to round?

Soak it with penetrating oil, wait 10 minutes, and use a proper 6-point socket — never an adjustable wrench. If the corners start to round, stop there and let a shop handle it; a rounded plug or stripped pan thread turns a $40 job into a $400 one.

Is topping off the same as changing the oil?

No. Topping off replaces volume, not quality — the additives in old oil deplete and combustion contaminants stay suspended in it. Fresh oil added to worn-out oil is still mostly worn-out oil.

How to Change Your Engine Oil & Filter

About 45 minutesModerate11 steps

An oil change is the most valuable DIY job on the car: about 45 minutes of work, and you know the right oil and filter actually went in. Shops charge $60–100 for what costs $30–50 in parts. The job is simple but the order matters — and you will be working under the car, so the safety steps are not optional.

Used engine oil is a carcinogen — wear nitrile gloves and wash up afterward. Never trust a jack alone to hold the car: ramps or properly seated jack stands are the only safe way underneath. If the drain plug will not loosen without rounding, stop and let a shop finish — stripped oil-pan threads cost far more than a service.