Change the Air Filter

Over the winter, your car's air filter can get clogged with salt and other thick debris. A clogged air filter can really lower your fuel efficiency. Replacing a dirty or clogged air filter can improve gas mileage by as much as 10 percent.

But how do you know when to change your air filter? The recommended interval is every 12,000 miles (19,312 kilometers), but that can be affected by the particular road and air conditions in which you drive. If you do a lot of driving on dirt or gravel roads, then your air filter is going to clog up much faster than an air filter in a vehicle that's used strictly for highway driving. The only real way to know if you need to replace your air filter is take it out and give it a quick inspection.

Interestingly, a slightly dirty air filter works better than a totally clean one. This is because the debris in the filter becomes part of the filtering process, trapping smaller particles that might have otherwise slipped past.

There's no real science to knowing when it's time to replace the filter. If it's really filthy, then it obviously needs to be changed. Otherwise, go with your gut. If you're preparing for a long summer of hard driving, then you might as well replace it. Air filters are relatively inexpensive.

Check Your Tires

Tires are one of the most overlooked parts of a car. According the Rubber Manufacturers Association (RMA), only one out of 10 drivers checks his or her tire pressure correctly, compared with almost seven out of 10 who wash their cars regularly. But the truth is that an under-inflated, over-inflated, worn down or misaligned tire can be extremely dangerous, particularly in hot summer weather.

Tire pressure changes with the rising temperatures -- approximately one to two PSI (pounds per square inch) for every 10-degree increase in outside air temperature. Consult your owner's manual or the sidewall of your tire to see what your tire pressure should be and check it with a hand pressure gauge or just let the guys at the service shop do it for you.

An under-inflated tire bulges outward and puts undo pressure on the sidewalls of the tire. With enough heat and pressure, that tire eventually will blow. An over-inflated tire, on the other hand, makes less contact with the road and can lead to hydroplaning in wet conditions.

Use the penny trick to see if you still have enough tread on your tires. Stick a penny in the tread, and if Lincoln's head disappears, you're good. Your local service shop or specialty tire store can also check your tires for proper alignment and balance.

And don't forget about your spare! There's no point in having a spare tire if your spare is in worse condition than the rest. Make sure the spare is properly inflated and has ample tread depth.

Wax to protect your car’s paint job

No way around it! Waxing your car is work. But it’s satisfying work that will help keep your car looking new. Car wax preserves paint by slowing oxidation and forming a barrier against bird droppings, sap, and pollution. Plus driving a nice shiny car is just plain fun.
Here’s what to do to ensure the maximum in protection:

• Liquid and spray waxes are tempting to use — they make the car shiny with less work than rubbing in paste wax. But there’s still no beating paste wax for the hardest, longest-lasting finish. Look for paste with a high carnauba wax content.
• Apply a thin, even coat of wax to the car’s surfaces with a damp sponge. Avoid applying too much, or it will be difficult to remove and some residue will inevitably mar your finish.
• To avoid fine scratches, use a clean, soft cotton or microfiber cloth to remove wax once it has dried.
• Apply an extra coat of wax to the nose and hood. The wax film in these areas wears away quickly.

Fill with washer fluid only

Don’t add water to the windshield washer reservoir. It won’t clean as well as washer fluid, and it may freeze in cold weather and damage the system. Don’t try to run your windshield washer system once you suspect there’s no more fluid in the tank, or you may damage the washer fluid pump.

Touch up nicks sooner rather than later

Touch-up paint won’t adhere well to rust. So be sure to keep some matching touch-up paint on hand so you can touch up any minor nicks, often found around door edges, before rust has a chance to form.

Keep leather from drying out and cracking

Leather cars seats are durable and don’t require a lot of maintenance. After a few years, however, the seats can become soiled. Use a leather cleaner to remove dirt and stains.Then apply a leather protectant formulated for pigmented or top-coated grain leather (the leather used for most leather car upholstery). Protectants will resist stains and make the upholstery easier to clean in the future. Choose a protectant that includes conditioners to keep your leather supple.