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Tread is in need of maintenance when: There are wear bars unevenly on the tire; if there are wear bars exclusively on the outsides OR insides of the tires (can be something as simple as improperly or unevenly balanced tires, or something more complex as the front end needing an alignment).
Consult your owner's manual for recommended oil-change intervals. Newer cars alert the driver when the oil needs to be changed, and the quick-lube industry has done an excellent job of promoting 3 months or 3,000 miles—whichever comes first—as a safe interval. For the do-it-yourselfer, an easy way to remember the 3,000-mile window is to change oil every time the odometer hits 3300, 6600 and 0000.
