At Spanial’s Service Center, we want our customers to be in the know. We want you to understand why and how your tires wear, how to improve your gas mileage, and to become a more informed vehicle owner. Hopefully, with the helpful tips below you’ll be able to improve your vehicle’s performance, mileage, and understanding of when and why your car needs to be serviced.
Alignments, A/C Check-Up, Oil Changes
& Tire Service Mileage Reminders
3,000-6,000 Miles: Change Standard Oil & Filter
6,000-10,000 Miles: Change Synthetic Oil & Filter
15,000 Miles: Change Air & Cabin Filters
25,000 Miles: Change Transmission & Brake Fluid
60,000 Miles: Change Fan/Serpentine Belts
75,000 Miles: Replace Shocks & Struts
90,000 Miles: Replace the Timing Belt
Car Maintenance and Care
• Change your fluids on time, every time.
• Change your oil every 3,000 miles for regular, 6,000 miles for synthetic oil
• Change antifreeze fluid every 30,000 miles.
• Change brake fluid every 30,000 miles.
• Change transmission fluid every 30,000 miles.
• Schedule a maintenance check every 15, 30, 60, and 90,000 miles.
• Replace your air filter every 12 months or 12,000 miles (whichever comes first).
• Replace your fuel filter every 2 years or 24,000 miles (whichever comes first).
Gas Mileage Tips
• Check and/or change your air filter every 6 months to improve fuel economy and keep your engine running smoothly.
• Don’t top off. Don’t bother topping off when filling your car’s gas tank. Any additional gas is just going to slop around or seep out.
• Tighten up that gas cap. Gas will evaporate from your car’s gas tank if it has an escape.
Loose, missing or damaged gas caps cause 147 million gallons of gas to evaporate each year.
• Go for the shade. The hot summer sun that makes the inside of your car feel like a sauna also evaporates fuel from your gas tank.
• Use the right oil. You can improve your car’s gas mileage by 1 percent to 2 percent by using the manufacturer’s recommended grade of motor oil.
Tire Maintenance and Care
• Rotate your tires every 5,000 miles or every 6 months.
• Check your tire pressures approximately once a week. Low tire pressures can affect fuel economy, handling and comfort.
To accurately measure your tire pressure, check tires when they are cold. Wait at least three hours after driving.
• Always make sure that your wheels are properly aligned. Badly aligned wheels will again lead to dragging of the car on the road.
• Check your spare tire each month and keep it properly inflated so it’s ready to go when you need it most.
• Use the penny trick to determine if the tread on your tires is worn to low. Take a penny and put Abraham Lincoln’s head into one
of the grooves of the tread. If part of his head is covered by the tread, you’re ok. If you can see all of his head, it’s time to replace the tire.
When the tread is worn down to 1/16 of an inch, tires must be replaced.
What Happens to a Tire as It Ages?
Sean Kane, president of Safety Research & Strategies, Inc., compares an aging tire to an old rubber band. “If you take a rubber band that’s been sitting around a long time and stretch it, you will start to see cracks in the rubber,” says Kane, whose organization is involved in research, analysis and advocacy on safety matters for the public and clients including attorneys, engineering firms, supplier companies, media and government.
That’s essentially what happens to a tire that’s put on a vehicle and driven. Cracks in the rubber begin to develop over time. They may appear on the surface and inside the tire as well. This cracking can eventually cause the steel belts in the tread to separate from the rest of the tire. An animation on the Safety Research & Strategies Web site shows how this happens. Improper maintenance and heat accelerate the process.
Every tire that’s on the road long enough will succumb to age. Tires that are rated for higher mileage have “anti-ozinant” chemical compounds built into the rubber that will slow the aging process, but nothing stops the effects of time on rubber, says Doug Gervin, Michelin’s director of product marketing for passenger cars and light trucks.
How Long Does a Tire Last?
Carmakers, tiremakers and rubber manufacturers differ in their opinions about the lifespan of a tire. The National Highway Traffic Safety Administration (NHTSA) has no specific guidelines on tire aging and defers to the recommendations of carmakers and tire manufacturers. Carmakers such as Nissan and Mercedes-Benz tell consumers to replace tires six years after their production date, regardless of tread life. Tire manufacturers such as Continental and Michelin say a tire can last up to 10 years, provided you get annual tire inspections after the fifth year. The Rubber Manufacturers Association says there is no way to put a date on when a tire “expires,” because such factors as heat, storage and conditions of use can dramatically reduce the life of a tire.
Heat: NHTSA research has found that tires age more quickly in warmer climates. NHTSA also found that environmental conditions like exposure to sunlight and coastal climates can hasten the aging process. People who live in warm weather and coastal states should keep this in mind when deciding whether they should retire a tire.
Storage: This applies to spare tires and tires that are sitting in a garage or shop. Consider how a spare tire lives its life. If you own a truck, the spare may be mounted underneath the vehicle, exposed to the dirt and the elements.
If your spare is in the trunk, it’s as if it is “baking in a miniature oven,” says Dan Zielinski, senior vice president of Public Affairs for the Rubber Manufacturers Association. Most often, the spare never sees the light of day. But if the tire has been inflated and mounted on a wheel, it is technically “in service” — even if it’s never been used, Gervin says.
A tire that has not been mounted and is just sitting in a tire shop or your garage will age more slowly than one that has been put into service on a car. But it ages nonetheless.
Conditions of use: This refers to how the tire is treated. Is it properly inflated? Has it hit the curb too many times? Has it ever been repaired for a puncture? Tires on a car that’s only driven on the weekends will have a different aging pattern than those on a car that’s driven daily on the highway. All these factors contribute to how quickly or slowly a tire wears out. Proper maintenance is the best thing a person can do to ensure a long tire life. Gervin recommends that you maintain proper air pressure in tires, have them rotated regularly and have them routinely inspected.
How To Determine the Age of a Tire
The sidewall of a tire is littered with numbers and letters. They all mean something, but deciphering them can be a challenge. This Edmunds article about reading a tire’s sidewall goes into greater detail, but for the purposes of determining the age of a tire, you’ll just need to know its U.S. Department of Transportation (DOT) number.
Tires made after 2000 have a four-digit DOT code. The first two numbers represent the week in which the tire was made. The second two represent the year. A tire with a DOT code of 1109 was made in the 11th week of 2009. Tires with a three-digit code were made prior to 2000 and are trickier to decode. The first two digits still tell you the week, but the third digit tells you the year in the decade that it was created. The hard part is knowing what decade that was. Some tires made in the 1990s — but not all — have a triangle after the DOT code, denoting that decade. But for tires without that, a code of “328” could be from the 32nd week of 1988 — or 1978.
Clearly, these DOT numbers weren’t designed with the consumer in mind. They were originally put on tires to make it easier for NHTSA to recall tires and keep track of their manufacturing date.
To make matters worse, you might not always find the DOT number on the outer side of the tire. Because of the way a tire is made, it is actually safer for the technician operating the mold to imprint information on the inner side of the tire, so some manufacturers will opt to put the number there. It is still possible to check the DOT code, but you might have to jack the car up to see it. Keep the visibility of the DOT number in mind the next time you are at a tire shop and the installer asks if you want the tires to be mounted with the raised lettering facing in.
That potential inconvenience is going away, however. NHTSA says that the sidewall information about the tire’s date of manufacture, size and other pertinent data is now required to be on both sides of the tire for easier reading.
After checking out a tire’s birth date, give the rubber a visual inspection. Some of the best advice on such an inspection comes from the British Tyre Manufacturers’ Association. It recommends that consumers check tires regularly for any sign of aging, such as tread distortion or large or small hairline cracks in the sidewall. Vibrations or a change in the dynamic properties of the tire could also be an indicator of aging problems, the association says. It recommends replacing the tire immediately if such symptoms appear.
Don’t Buy Used
Tires are expensive, especially when you factor in the price of mounting and balancing. That’s why used tires become more attractive to consumers who are strapped for cash. But the purchase of used tires is very much a buyer-beware situation, Zielinski says. “Even a one-year-old tire can be dangerous if it was poorly maintained,” he says.
When a consumer buys a used tire, he has no idea how well it was maintained or the conditions in which it has been used. The previous owner might have driven it with low pressure. It could have hit curbs repeatedly. It could have been patched for a nail. Further, it’s a dated product.
“You wouldn’t want a used tire for the same reason that you wouldn’t buy a 10-year-old computer,” Zielinski says. “You are denying yourself the advancements in tire technology over the past few years.”
Make Sure You’re Getting a “Fresh” Tire
Just because a tire is unused doesn’t mean it’s new. In a number of instances, consumers have purchased “new” tires at retail stores only to find out later that they were manufactured years earlier. In addition to having a shorter life on the road, a tire that’s supposedly new but is actually old may be past its warranty period.
If you buy tires and soon after discover that they’re actually a few years old, you have the right to request newer ones, Zielinski says. Any reputable store should be willing to make amends. “It is fair for a consumer to expect that ‘new’ is not several years old,” he says.
Getting rid of an unused spare or a tire with good-looking tread may be the hardest thing for a thrifty consumer to do. “Nobody’s going to take a tire that looks like it’s never been used and throw it out,” Kane says. But if it’s old, that’s exactly what the owner should do.
Although Kane has lobbied NHTSA to enact regulations on tire aging, nothing is currently on the books. A NHTSA spokesman says the organization is “continuing to conduct research into the effects of tire aging, and what actions consumers can do to safely monitor their tires when they are on their vehicles.”
It’s too bad that tires don’t have a “sell by” date, like cartons of milk. Since there’s no consensus from government or industry sources, we’ll just say that if your tire has plenty of tread left but is nearing the five-year mark, it’s time to get it inspected for signs of aging.
Of all your vehicle’s components, tires have the greatest effect on the way it handles and brakes. So if the tire store recommends new tires at your five-year check-up, spend the money and don’t put it off. Your life could depend on it.