Popping the hood on your own car can feel intimidating the first time, especially if you have spent years just handing the keys to a mechanic and hoping for the best. But checking your fluids is one of the simplest, cheapest ways to catch a small problem before it turns into a repair bill that wrecks your budgeting basics for the month. Give yourself 20 to 30 minutes on a Saturday morning and you will walk away knowing exactly what is going on under your hood.

This guide covers the six fluids every gas-powered car relies on: engine oil, coolant, brake fluid, power steering fluid, transmission fluid, and washer fluid. Every vehicle is a little different, so exact locations, capacities, and specs vary by year, make, and model. For a video walkthrough matched to your specific car, CarCareKiosk has free, model-specific how-to videos you can search by plugging in your year, make, and model.

What You'll Need, and What This Costs

The good news is that checking fluids requires almost no special equipment. Most of what you need is probably already in a kitchen drawer or garage shelf.

• A clean rag or a few paper towels (microfiber works great and does not leave lint behind)
• Your owner's manual, or a phone with the CarCareKiosk site pulled up
• A flashlight, since engine bays are darker than you think even in daylight
• Disposable gloves if you would rather keep your hands clean
• A funnel, only if you plan to top off a fluid yourself

Difficulty is beginner-friendly across the board. Checking every fluid on this list takes roughly 20 to 30 minutes total and costs you nothing beyond the price of a rag. Topping off a fluid, if it is low, might run you anywhere from 5 dollars for a bottle of washer fluid to 15 or 20 dollars for a quart of the correct engine oil or a jug of coolant. Compare that to a tow bill or an engine replacement, and this is about the best return on time you will find in car ownership.

Engine Oil: The One Everyone Knows to Check

Engine oil lubricates every moving metal part inside your engine, and running low can cause catastrophic, expensive damage in a matter of minutes. Check it when the engine is off and has been sitting for at least five to ten minutes so the oil has time to drain back into the pan, giving you an accurate reading.

1. Park on level ground and pop the hood, then locate the dipstick, usually marked with a brightly colored loop handle, often yellow or orange.
2. Pull the dipstick all the way out and wipe it clean with your rag.
3. Reinsert it fully, then pull it out again and look at the oil clinging to the end.
4. Check the level against the min and max markings, sometimes shown as two pinholes, a crosshatched zone, or the letters L and F.
5. While you are there, check the color. Fresh oil is amber and translucent. Dark brown or black oil is not necessarily dangerous on its own, but gritty, sludgy, or milky oil is a red flag worth mentioning to a mechanic.

If the level sits below the minimum mark, add oil in small increments, checking again after each pour, since overfilling can cause its own problems. Always use the viscosity grade listed in your owner's manual, commonly something like 5W-30 or 0W-20 depending on your vehicle.

Coolant: Keeping the Engine From Overheating

Coolant, sometimes called antifreeze, circulates through your engine and radiator to keep temperatures in a safe range in both summer heat and winter cold. Most modern cars have a translucent plastic overflow tank near the radiator with min and max lines printed right on the side, so you often do not even need to open anything to check the level.

Look at the tank when the engine is cold. If the level sits between the lines, you are fine. If it is low, top off with a 50/50 mix of coolant and distilled water, or a pre-mixed coolant if your car calls for one, matching the color and type already in the system whenever possible, since mixing incompatible coolants can cause sludge.

Never open a radiator cap or coolant reservoir cap on a hot or even warm engine. The system is pressurized and can spray scalding coolant that causes serious burns. Wait until the engine has fully cooled, ideally a few hours after driving.

Brake Fluid: Small Reservoir, Big Responsibility

Brake fluid transfers the pressure from your foot on the pedal into the clamping force that actually stops the car, which makes this one of the fluids you never want to ignore. The reservoir is usually a small, translucent plastic container near the back of the engine bay on the driver's side, often labeled with a brake symbol.

Check the fluid level against the min and max lines molded into the side of the reservoir, no need to open the cap just to look. Fresh brake fluid is light and slightly yellow; dark, murky, or nearly black fluid has absorbed moisture and contaminants over time and should be flushed by a professional, since brake fluid affects your ability to stop the car safely. A slowly dropping level over months can be normal as brake pads wear thin, but a sudden drop, especially paired with a soft or spongy pedal, means it is time to get the car looked at right away rather than just topping it off yourself.

Power Steering and Transmission Fluid

Power steering fluid makes turning the wheel effortless instead of a full upper-body workout. On many cars it has its own small reservoir with min and max marks, similar to brake fluid, though a growing number of newer vehicles use electric power steering and skip this fluid entirely. If your steering feels stiff, makes a whining noise when you turn, or the fluid looks foamy or dark, that is worth a check.

Transmission fluid is trickier. Some cars have a dipstick you check similarly to engine oil, often with the engine running and warm, in park or neutral, since the exact procedure varies significantly by car. Others, especially many newer automatics and most manuals, have sealed transmissions with no easy owner-check dipstick at all, requiring a lift and a professional check. Fresh automatic transmission fluid is typically bright red and should smell relatively neutral; fluid that smells burnt or looks brown and gritty is a sign of internal wear that deserves a mechanic's attention, not a DIY top-off.

Washer Fluid and the Final Walkaround

Washer fluid is the lowest-stakes fluid on this list, but running out at the wrong moment, say a bug swarm on the highway, is genuinely dangerous since it can blind you for a few seconds. The reservoir is almost always capped with a blue windshield icon and sits somewhere visible near the front of the engine bay. Simply unscrew the cap, look inside with your flashlight, and top off with washer fluid rated for your climate, since winter-blend fluids resist freezing down to much lower temperatures than summer blends.

Once you have checked all six fluids, take thirty more seconds to glance underneath the car for any fresh puddles or drips, and check the color if you see one: amber usually means oil, greenish or orange often means coolant, and a clear, oily puddle near a wheel can point to brake or power steering fluid. This quick habit, done monthly or before any long road trip, catches leaks long before they become breakdowns.

When to See a Mechanic Instead

Checking and topping off fluids is well within reach for a first-timer, but certain signs mean it is time to hand the car to a professional rather than DIY further. Rapidly dropping fluid levels, fluid that looks milky, gritty, or burnt, a soft brake pedal, or any fluid mixing with another (like coolant appearing in your oil) all point to a mechanical issue beyond a simple top-off. When in doubt, a quick trip to a trusted shop is far cheaper than guessing wrong on something safety-related like brakes or steering.

Getting comfortable under your own hood is a genuinely useful skill, and it pairs nicely with the kind of hands-on car culture we love talking about. For more real-world car content, tips, and the occasional build inspiration, follow TRE Forged on Instagram (@treforged).