Pop the hood of your car, and you’ll find a whole lineup of fluids quietly doing the heavy lifting — cooling, cleaning, lubricating, and keeping your car safe and smooth on the road. And while it’s easy to forget about them until something goes wrong, a little attention goes a long way.
In a recent video, @nickscleancars broke down the six essential fluids every driver should know — and, more importantly, how often to check and change them. Whether you’re new to car care or just looking for a refresher, here’s what you need to know to keep your vehicle in top shape.
Engine Oil: Check Monthly, Change Every 5,000–10,000 Miles
This is the big one. Your engine oil keeps everything inside the engine moving smoothly, reducing friction and carrying away heat. Over time, oil breaks down and picks up grime, which is why regular oil changes matter so much. Most vehicles need an oil change somewhere between every 5,000 and 10,000 miles, depending on the oil type and your driving habits. Check the dipstick once a month—if the oil looks dark or smells burnt, it’s time for a change.
Transmission Fluid: Check Monthly, Change Every 30,000–60,000 Miles
Transmission fluid is what keeps your car shifting smoothly. Like oil, it breaks down with heat and use. If the fluid is dark, smells burnt, or you’re feeling clunky shifts, it’s probably overdue. Some newer cars have “lifetime” transmission fluid, but it’s still smart to check around 30,000 miles and consider a change between 60,000 and 100,000 miles to keep things running right.
Brake Fluid: Check Every 6 Months, Change Every 2–3 Years
Brake fluid is easy to forget, but critical to safety. It helps transmit the pressure from your foot to the actual brakes. Over time, it absorbs moisture from the air, which can reduce braking performance and lead to corrosion. You’ll want to check it at least twice a year. If it’s dark or murky, that’s a red flag—it should be clear or lightly yellow. Changing it every 2–3 years is a good rule of thumb.
@nickscleancars Hey guys its Nick from NicksCleanCars. Here a the types of fluids found in cars, what their function is and why it is important to check your vehicle fluids regularly. #carmaintenance #vehiclefluids #cartiktok #fyp ♬ original sound – nickscleancars
Coolant: Check Every 3–6 Months, Change Every 2–5 Years
Coolant (or antifreeze) helps keep your engine from overheating and prevents freezing in cold weather. It also protects against rust and buildup inside your radiator. You’ll find the coolant reservoir near the front of the engine bay, usually translucent with max/min lines. If the fluid level is low or looks rusty or sludgy, it’s time to flush and refill. Coolant typically lasts 2 to 5 years, depending on your vehicle and coolant type.
Power Steering Fluid: Check Every 6 Months, Change Every 50,000–100,000 Miles
Power steering fluid helps you turn the wheel easily. If your steering feels stiff or makes a whining noise, low or dirty fluid could be to blame. Not all cars still use hydraulic power steering (many newer models are electric), but if yours does, it’s worth checking every six months. Changing it somewhere between 50,000 and 100,000 miles can prevent pump wear and leaks.
Windshield Washer Fluid: Check Monthly, Top Off As Needed
Washer fluid might not affect your engine, but clear visibility is just as important. Check the reservoir once a month and top it off whenever it runs low—especially during bug season or winter when road grime builds up fast. Pro tip: In colder climates, use a winter formula so it doesn’t freeze on the windshield.
Keep It Simple, Keep It Running
Taking care of your car’s fluids doesn’t have to be complicated. Most of these checks take just a minute, and catching a problem early can save you from expensive repairs down the road. Think of it like brushing your teeth—it’s basic maintenance that keeps bigger problems away.
So next time you’re filling up at the gas station or parked in the driveway, take a quick look under the hood. A clean dipstick or a topped-off reservoir is more than peace of mind — it’s the kind of everyday car care that keeps you safely (and smoothly) on the road.