Top 10 Car Maintenance Mistakes

Some simple tips to save money and add life to your ride.

By Tom Wilson of MSN Autos

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Shrewdly following the maintenance schedule provided in your car's owner's manual can prevent lengthy or more expensive visits to the service shop.

Compared to the family trucksters of a generation ago, modern cars require about as much maintenance as a toaster. This is a real liberation from the oil, lube and tune merry-go-round that ruled not so long ago.

Curiously, many people haven't adjusted their thinking to keep pace with new car maintenance schedules. The preoccupied still run their daily drivers without service until the dash warning lights burn out, while over-achievers fret about running synthetic oil more than 2,500 miles without a change.

Although maintenance intervals are now more widely spaced, even the newest cars require scheduled service to live long, productive lives. Whether yours is the latest model or you paid it off years ago, the trick is giving your car the maintenance it was designed to receive.

Surprisingly, the answer to what maintenance is required is hiding no farther away than the glove box. Every car is supplied with a maintenance schedule — in the owner's manual or in a separate maintenance log book — that details that vehicle's needs. A few minutes assimilating these requirements will help you avoid the following common car-maintenance pitfalls.

Proper Tire Inflation and Rotation
Tires leak naturally and need the occasional check. Figuratively speaking, underinflated tires suck up gasoline. Under- or overinflated tires wear out sooner, and deliver the same emergency maneuver handling as marshmallows. You probably aren't going to check tire pressures monthly, but how about twice a year?

Furthermore, front and rear tires wear differently and should be rotated to even that wear. Your owner's manual will have a recommendation on both pressure and rotation periods.

Discuss:  What other car maintenance mistakes should be added to this list?

Wiper Tales
Here's a news flash: It's much easier to avoid hitting things you can see. Simple as it is, that's the concept behind replacing your windshield wipers before they fossilize into noisy uselessness.

Fall is the ideal wiper replacement time: after the blade-baking summer and before the fall and winter nastiness. Depending on location, wiper replacement may be an annual affair in the Southwest to a biannual chore in northern climes.

Tune-Up Anachronism
There are no more "tune-ups." Valves no longer need adjusting, ignition timing is computer controlled and there are no carburetors to fiddle with. About all that's left of the old tune-up drill are the spark plugs. These are often good for 100,000 miles, so don't change parts just to change parts. Instead, save up for those big 60,000- and 120,000-mile services when the timing belt, spark plug wires and coolant are due for replacement.

Octane Overdose
"If some is good, more is better" thinking does not apply to octane. Here the rule is to supply whatever octane the engine is rated for and call it done. Higher-than-required octane does not yield more power or mileage, only oil company profits.

Some engines are rated for premium 91 octane fuel but can burn 87 octane regular, thanks to the magic of knock sensors. In that case, run regular gas if puttering around surface streets, and premium fuel if full-throttle driving is part of your daily repertoire.

Oil Change Timing
Oil changes every 3,000 miles used to be required jobs, just like cleaning the accumulated fuzz from record player needles or defrosting freezers. Today, advances in engine design and lubricants make oil changes something to be done when the schedule calls for it, not when granddad says it's time. Some cars call for 5,000-mile change intervals, some up to 15,000-mile stints. Others have a variable timer. Follow the schedule and use the oil called for by the manufacturer.

Tired Tires
Tires wear out, but they also time out. The tire industry says tires are toast after five years, but they're selling tires. It all depends on heat, sunlight and ozone conditions. There's little argument from any pundits that after seven years those black donuts are dried and better off holding down a farmer's tarp than carrying your family around. If you're not sure how old your tires are, a tire shop can read the date code stamped into the sidewall.

Dirty Air Filter
Semi-clogged air filters hurt fuel economy for the same reason you don't like to run with a potato in your mouth. The question is, when is your filter dirty? Under a Norman Rockwell schedule of small-town errand running and church duty, an air filter might not see much grit. But grimy city surface streets or just looking at a dirt road on a map are often enough to overwhelm air filters. This one is about conditions. If you go near dirt, the air filter may need changing twice as often as the schedule calls for.

Discuss:  What other car maintenance mistakes should be added to this list?

Ignoring Your Brakes
Note to the Wandering Unconscious: If you notice anything different about your brakes — sound, feel or response — they are telling you to visit a mechanic. Now.

Tighten Your Gas Cap
Is the Check Engine light on? Then make sure the gas cap is on tightly before calling the dealer. No joke, this is one of the most common ways of setting off your car's diagnostic system, since a loose gas cap defeats the fuel system's venting arrangement.

The Garage Is for Parking
Let's review. Your house is your most valuable investment. Your car is likely your second most valuable investment. If you're paying all that money, then why are you storing empty cardboard boxes, broken skateboards and plastic holiday wreaths in the garage? Pitch that junk and get the car in the garage!

If it has an engine and moves, Tom Wilson is interested in it. Now a freelance auto writer, Tom tries to ride, drive, fly and float everything he can wiggle into. His credits include a few local racing championships, a decade of magazine editing, three technical engine books and many hundreds of magazine articles. Current interests include new fuels and vehicle technology.

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