"In fall, windshield-washer fluid needs to be replaced with a solvent that is suited for use in cold weather," says Molla. The washer fluid costs $2 to $4 per gallon, depending on the brand and whether it has antifreeze mixed in.

Travers says autumn is also a good time to check your level of antifreeze ($10 to $16 per gallon) in the coolant recovery reservoir. In this car maintenance move, if you find that you are below the required minimum stamped onto the side of that opaque container, add the appropriate quantity of properly diluted fluid to that reservoir and not to the radiator. Make sure that you use the correct fluid because green and orange antifreeze/coolant cannot be mixed.

Checking the brake-fluid reservoir is also a good idea. If the level is low, top it off with the appropriate type of brake fluid ($3.50 to $17 per container, depending on the type). "As your brakes wear, it's normal for the fluid to go down a bit," says Molla. "However, if you notice a bigger decrease, that could be an indication that you have a leak or other issue in the braking system."