4. Routine maintenance, inspection and operational testing of the emergency generator and associated. components must be overseen by a properly trained person [see MSFC(07), Sec. 604.5; NFPA. 99(99), Sec. 3-4.4.1.1(b)3; NFPA 110(99), Sec. 6-4.7; NFPA 110(02), Sec. 8.4.7].
Replace the tires at least every 6 years. If you're not sure, the minimum replacement time that is recommended by the NHTSA is six years regardless of use, with 10 years being the maximum service life for tires. Check your owner's manual for specific recommendations related to your car.s the tires wear, these bars will become flush (level or even) with the tire's tread. At this point, it's time to replace the tires. 3. Check the tread by using the penny test.  Take a penny, and place it upside down with Lincoln facing you in the center of the tread (at the thickest part of the tire).
Go to tirerack.com and do some research. After you enter some details and find the tires, pick a few and read the reviews. After that go to survey results and you will find color coded informations. I expect my wife's 2006 Sienna (25k) will need new tires at 30k. I've done some research at Tire Rack and am leaning toward the Yokohama Avid TRZ or a Dunlop SP60. The OEM tires weren't bad, but wore out too quickly for my liking. I wouldn't put too much credence in what Pep Boys says about tires since that is what they're trying to sell.