Which one do you choose struts or shock bsorbers

Maybe forever, if you rely on an overly liberal interpretation of the maintenance schedules set by some vehicle manufacturers. That doesn’t mean you should ignore them or even accept the manufacturer’s recommendations, though; instead, add them to your list of items that should be checked annually after the first three or so years of ownership.

With accessory drive belts, most manufacturers recommend only a periodic inspection for cracks, fraying or other visible wear, and on some GM vehicles the first inspection isn’t until 10 years or 150,000 miles, when someone else might own the vehicle.

Hoses? What about them? Most owner’s manuals don’t even mention radiator or coolant hoses (except that they can get really hot on an overheated engine). Other hoses, such as for the power steering or air conditioner, usually are mentioned only as something that should be checked as part of routine maintenance or when leaks are suspected.

Coolant hoses typically last several years, though anything longer than 10 years may be pushing the limits. Rubber weakens with age and from repeated exposure to hot coolant, so the older they get the higher chance they’ll leak and cause the engine to overheat.

Drive belts are usually the serpentine type that snake their way around pulleys to power the alternator, air conditioning compressor, power steering pump and perhaps the water pump, and they’re designed to last several years.

When to replace a drive belt is a judgment call by a repair technician, and it’s up to the vehicle owner to decide if the time is right given the manufacturers have largely chosen to stay out of it. We would err on the side of caution, because when a drive belt breaks your car comes to a halt. Depending on where this happens and when, a belt that fits your car may not be available until tomorrow, leaving you stranded.

Don’t confuse a drive belt with a timing belt, which connects the crankshaft to the camshafts and controls the timing of when valves open and close. Timing belts are out of view behind a timing cover and more complicated and expensive to replace, mainly because of the additional labor. Many vehicles have timing chains that are considered good for the life of the vehicle, but timing belts usually have a recommended mileage before changing. In some cases, that’s as soon as 60,000 miles but in others it can be 100,000 or more.

Worn ball joints allow too much movement in the suspension, so the driver may feel more vibrations — or hear squeaks or rattles on bumpy surfaces or when turning — caused by looseness in the suspension. Other signs of worn ball joints include uneven tire wear and steering that wanders instead of going straight.

Because these symptoms also can apply to other suspension and steering issues, any or all of the above are good reason to have a thorough inspection conducted by a qualified mechanic before pointing the finger at the ball joints. Some ball joints have wear indicators, but others have to be checked by raising the car off the ground and seeing if the wheels allow excessive play. In addition, some ball joints have rubber dust covers that, if torn, can allow dirt and water in. That can damage the joint.

Front ball joints connect the suspension control arms to the steering knuckles; their ball shape allows the suspension to move up and down and the wheels to pivot when you turn the steering wheel. On vehicles that have rear ball joints, they act like hinges to allow the wheels to move up and down with the road surface. Vehicles with strut-type front suspensions have only lower ball joints, but double-wishbone styles have upper and lower ones.

They often last more than 100,000 miles but can wear out earlier if driven frequently on rough roads, which puts more stress on the suspension. Load-bearing ball joints that carry the weight of the vehicle tend to wear out sooner than those that aren’t load-bearing. Ball joints used on most modern vehicles have grease sealed inside them (some require that grease be added periodically). The seals can leak with age, and once the grease leaks out, that will accelerate wear and eventually cause failure.

Don’t ignore warning signs of worn ball joints, because eventually they can break. That can break a control arm or other suspension part, allowing the wheel to come loose. Ball-joint replacement is typically not listed on a vehicle’s maintenance schedule, but many manufacturers recommend they be inspected for wear at regular intervals, such as at oil changes.