How I Can Tell What That Leak in My Driveway Is?

Whether you spot a puddle under your car or just a few drops, there are several possible culprits, and color alone might not explain what it is. How can you figure it out? To be sure, you’ll need to pinpoint where it’s coming from using your eyes and your nose.
Ways to Identify Leaking Fluids

Engine oil can be amber (if it’s fresh), brown or — if it hasn’t been changed for 10,000 miles — black, and it will leave slickness on your fingers that’s hard to wipe off. Oil can leak from gaskets and seals on the front or rear of an engine, from valve covers or from the oil pan underneath, so there are several possible sources of an oil leak.

Transmission fluid is usually reddish and slick, though some come in other colors and can be thicker or thinner than engine oil. If you suspect a transmission fluid leak, consult your owner’s manual to see how to check the fluid level. If you can get a clear look at the transmission, check for leaks around the seals or gaskets.

Power-steering fluid is usually reddish, and on some vehicles it’ll be the same fluid that goes into the transmission. Check the fluid level in the power-steering reservoir and look for leaks in the reservoir and the hoses coming from it.

Engine coolant can be green, yellow, pink or another color, so check your coolant overflow tank to see what’s in your radiator. Is the overflow tank empty? Maybe you’ve found your problem. Coolant usually feels like slimy water and has a sweet smell. Leaks can come from the overflow tank, the radiator, the water pump, coolant hoses and elsewhere. For your own safety, wait until your engine is cold before opening the radiator cap.

Brake fluid can be light brown or even clear when new, but it typically darkens as it ages. It’s also slippery — and vital to stopping your car. That’s a good reason to treat a brake fluid leak as an emergency. Check the brake fluid level in the reservoir (usually near the firewall on the driver’s side) and see if you can see any leaks there. The fluid gets pumped through brake lines to the wheels, so leaks could be much further downstream and out of sight.

A few drops of fluid on your driveway isn’t reason to panic, especially on an older car. Seepage and minor leaks are par for the course on vehicles with several years and thousands of miles on the clock. That said, any leak should be a wake-up call to keep an eye on things before it becomes a gusher, and to regularly check fluid levels (all of them) to make sure you aren’t running low anywhere.