Get rid of road salt on the undercarriage. Road salt can damage your vehicle by eating away at its undercarriage. Use a garden hose with as much water pressure as your system can muster to loosen winter grime and salt. Or, if you have a movable lawn sprinkler that's low enough, set that under the vehicle to wash away what you can't reach.
Check the tires. Tire pressure changes about 1 pound per square inch for every 10 degrees Fahrenheit change in outside temperature, so it's important to check tire pressure after weather changes. Check your owner's manual for the recommended pressure for your tire, and never exceed that. Always check pressure when the tires are cold, since driving even a couple of miles to the gas station can provide a false reading. Higher pressure generally results in improved steering response and fuel economy, but a stiffer ride, and it wears out the tread in the center. Underinflation generally provides a smoother ride, but it causes tires to wear out at the sides. It also wastes gas because tires need more power to push the vehicle.
Check wiper blades. Your wipers work hard all winter removing dirt and debris, including salt spray. Since the life expectancy of a wiper blade is six months to a year, check that the blades are making full contact with the windshield and have not dried out. Don't wait for a heavy spring or summer rainstorm to discover your blades aren't performing properly. Also, refill the wiper fluid reservoir.
Rotate the tires. This is a relatively simple car care procedure that will extend the tread life of your tires, and should be done roughly every 10,000-20,000 kilometers. Check your owner's manual for exact intervals. A good rule is to rotate tires after every oil change.
Change the oil and oil filter. Some car manufacturers recommend changing to a heavyweight oil to help the engine perform more efficiently during hotter weather. Most cars now have recommended oil grades of 5W-30, 10W-30 or 10W-40, which are all multiviscous grades — your owner's manual will tell you which. Change the oil filter each time you change the oil, since it's obvious that a dirty filter won't keep the new oil clean.
Change the air filter. The air filter prevents dust and other impurities from getting into the combustion chambers of the cylinders, resulting in wasted gas and weaker engine performance. Replacing a clogged filter can improve mileage by as much as 10 percent. The time-honored way to check for dirt is to hold the filter up to the light, but since many new filters show light when dirty, or show no light when clean, it is more reliable to change the air filter every six months, and more often in dusty locations.
Flush and fill your cooling system. This is cheap insurance against engine failure. The Car Care Council recommends flushing every two years,for most vehicles. Simply draining your radiator is not enough; you need to flush the system with a radiator flush product, not just plain water, to remove stubborn rust, grease and sediment.
Check the radiator and gas caps. A snug radiator cap helps raise the cooling system pressure, giving added protection against boil-overs. Radiator caps don't last forever, so replace yours whenever you flush the cooling system. Pressure recommendations vary, so get the right cap for your vehicle model. With gas at record prices, be sure there's a tight seal on the gas cap, too, to prevent that high-priced octane from vaporizing. Nearly 20 percent of vehicles have gas caps that are damaged, loose or missing altogether, wasting some 147 million gallons of gas every year.
Check the battery and spark plugs. Make sure battery posts and connections are secure and free of corrosion. Spark plugs fire as many as 3 million times every 2,000 kilometers. That's a lot of heat and wear and tear in the form of electrical and chemical erosion. Dirty spark plugs cause misfiring, which wastes fuel. If you're planning a long trip, consider replacing the battery and spark plugs if they are more than two years old.
Clean the cabin. Appearances are important, no matter what the season. Discard the debris that's been hibernating under the seats all winter, then attack the cabin with the most powerful vacuum cleaner you can find. Remove the floor mats to vacuum or wash outside the car. Open the trunk, remove the spare tire and jack and vacuum here, too. Before returning the spare, check its pressure. Most likely it will need air, so remember to do that the next you time you fill the tank. Road dust, coffee stains and fingerprints have no appeal any time of the year, so after vacuuming, use a spray vinyl cleaner and a soft cloth on the dashboard, steering wheel, door panels and seats. That also helps protect against cracking, sun damage and fading. A good household upholstery cleaner is fine for fabric seats; for leather seats, follow manufacturer's recommendations. Next is an aerosol silicone spray to treat the weather stripping around the outside of doors, windows and the trunk. Be sure to wipe away the excess
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