Check your own oil, then change it once yourself

Quick answer: Check your oil once a month, on level ground, engine off. Do one full oil change yourself, even if you go back to paying someone, because the woman who's done it once can't be talked into a fluid flush she doesn't need.

The guy at the quick-lube counter is holding up a gray, dusty engine air filter. He's telling you it is "pretty bad." You have no idea if that's true. Neither does he, honestly, because he hasn't checked your mileage. You say yes because saying no feels like admitting you don't know.

That moment is the whole reason to learn this. The money matters too. But mostly you'll never again stand at a counter feeling like the only person in the room who doesn't speak the language.

The five-minute check that matters more than the change

Most people treat the sticker in the windshield as the entire oil plan. That sticker only tells you when the oil is due to be swapped. It tells you nothing about whether your engine is quietly burning or leaking it in between. Plenty of engines, especially as they age, use some oil between changes. A car can be a quart low and you'd never know until a light comes on.

Do this on the first Saturday of every month:

• Park on level ground. A sloped driveway gives you a wrong reading.
• Turn the engine off and wait a few minutes so the oil drains back down into the pan. Your owner's manual will say whether it wants a warm or cold check. Follow it.
• Pop the hood and find the dipstick. It usually has a bright yellow or orange loop handle.
• Pull it, wipe it clean with a paper towel, push it all the way back in, then pull it again.
• Read where the oil sits between the two marks. They might be dots, holes, the letters L and H, or a crosshatched patch. Anywhere between them is fine. Near the bottom mark means add oil.

On most cars the gap between the low and full marks is roughly one quart. So if you're at the bottom, you don't need much.

Then look at it. New oil is amber and clear. It darkens with use, and dark by itself isn't a problem. These are:

• Milky or foamy, like coffee with cream. That can mean coolant is getting into the oil. Don't drive it around for a week. Get it to a mechanic.
• Gritty when you rub a drop between your fingers. Also a mechanic visit.
• Dropping noticeably every month. Something is leaking or burning, and it's worth finding before it gets expensive.

One warning. Some newer cars, especially some European models, have no dipstick at all and report oil level through the dashboard. If you can't find one, check the manual before you assume you're missing something.

Topping it off without making a mess

Find the oil filler cap on top of the engine. It's usually marked with a little oil-can symbol, and often the oil grade is printed right on it, something like 0W-20 or 5W-30. If it's not on the cap, it's in the manual. Use exactly that grade. This isn't a place to improvise.

Use a funnel. Add half a quart, wait a minute, check the dipstick, repeat. Overfilling is a real problem, not a cosmetic one. Too much oil can get whipped into foam by the moving parts, and foam doesn't protect anything.

Keep one quart of the right oil and a funnel in a bin in your trunk. That's the whole kit for the check.

The one light you never ignore

Your dash has two kinds of oil warnings, and people mix them up.

A wrench symbol or an "oil life" percentage is a maintenance reminder. It's telling you a change is due soon. Schedule it.

A red oil can is oil pressure. If that comes on while you're driving, pull over somewhere safe and shut the engine off. Not at the next exit. Now. An engine running without oil pressure can destroy itself in a very short time, and a tow is far cheaper than a new engine.

Doing the full change, once

Here's the concession up front. On some cars, doing your own oil change saves less than you'd think, and on a few it's a genuine pain: low sports cars, trucks with skid plates, engines with the filter buried. If you don't have a level, solid place to work, don't do it in a sloped apartment lot. Pay someone and keep the check.

But if you can, do it once. You'll need:

• The right oil, enough for your engine's capacity (most cars take somewhere around four to six quarts; your manual has the exact number)
• A new oil filter matched to your car (the parts store computer will look it up)
• A new drain plug washer, sometimes called a crush washer
• A socket or wrench that fits your drain plug
• An oil filter wrench
• A drain pan, a funnel, nitrile gloves, paper towels
• Ramps or jack stands rated for your vehicle. Never, ever get under a car held up by a jack alone. Jacks are for lifting. Stands are for staying up.

Step by step

1. Run the engine for a few minutes so the oil flows easily. Not a long drive. Hot oil burns skin.
2. Drive up onto ramps or lift and set on stands. Set the parking brake and chock the wheels still on the ground.
3. Find the drain plug on the bottom of the oil pan, the metal basin under the engine. Make sure it's the oil pan and not the transmission. Draining the wrong fluid is the classic first-timer mistake, and it's a bad one, because you'll then pour five quarts into a full engine.
4. Slide the pan under it and loosen the plug counterclockwise. Spin the last few turns by hand, then pull it away quickly. Oil comes out at an angle, so position the pan a little ahead of the plug.
5. Let it drain for ten or fifteen minutes.
6. Remove the old filter with the filter wrench. Some oil will spill out. That's normal. Then check that the old rubber gasket came off with it. If it stuck to the engine and you put the new filter on top, you've got a double gasket and a leak.
7. Rub a little fresh oil on the new filter's gasket and spin it on by hand until it touches, then follow the tightening instructions printed on the filter (often about three-quarters of a turn more). Hand tight. No wrench.
8. Reinstall the drain plug with the new washer. Snug it. Don't crank it. Stripping the threads in an oil pan turns a cheap job into a costly one. The manual lists the exact torque if you have a torque wrench.
9. Pour in a quart less than the full capacity, then check the dipstick and add to the full mark.
10. Start the engine for thirty seconds, look underneath for drips at the plug and filter, shut it off, wait a few minutes, and check the level one last time.
11. Reset the oil life monitor. Your manual tells you how.

Pour the old oil into the empty jugs. Most auto parts stores take used motor oil and often used filters for free. Call ahead. Never pour it down a drain or onto the ground.

Leave the driveway better than you found it

Put cardboard down before you start. If oil gets on the concrete anyway, cover it with cheap clay cat litter, let it sit overnight, and sweep it up. If you borrowed ramps from your dad or a neighbor, wipe them down before they go back, and return them with a quart of oil as a thank-you.

Write the date, mileage, and oil grade in a notebook in the glove box, and keep your receipts. Under federal law, doing your own maintenance doesn't void a manufacturer's warranty, but you want proof it was done on schedule. It's the same principle as walking into a raise conversation with a spreadsheet. Records win arguments.

What changes at the counter

Next time you're at the quick-lube shop, you'll know your oil grade and when your filters were last done. When the air filter comes out, you can say, "I replaced that in the spring, thanks," and mean it. No apology. No nervous laugh. It takes the same nerve as negotiating an offer for the first time, and it gets easier just as fast.

Then teach your daughter. Check your mother's car while you're at it. The dipstick takes five minutes.

The confidence lasts a lot longer.