Like violins, cars announce their need for a tune-up by squeaking shrilly and leaking oil every time you play Mahler. Keep your ride purring pleasantly with today's Groupon: for $40, you get an oil-change package at All Tune and Lube (a $156.55 total value including tax). The package includes the following:

• Semisynthetic oil change, lube, and safety inspection (an $18.98 value)
• Tire rotation (a $40 value)
• Set of new wiper blades (a $15 value)
• Air-conditioning performance check (a $24.98 value)
• Cooling-system check (a $39.98 value)
• Disposal and shop-supply fees (a $5.50 value)

Wielding computerized diagnostics equipment, All Tune and Lube's skilled technicians examine autos to pinpoint potential complications and perform preventative care. Motors slurp up to five quarts of semisynthetic oil (full synthetic is available for an extra fee), which cuts down on engine-damaging friction by lubricating and cooling sensitive parts, then slip into a fresh filter to remove common oil contaminants, such as inadequately pressed olives. After going over the air-conditioning and radiator-cooling systems with a stethoscope, the mechanics inspect the auto to ensure that each essential component meets rigorous safety standards. A new set of wiper blades keeps windshields free of rain, and a speedy tire rotation helps to spread tread wear evenly across your car's rubber shoes. As a complimentary service, All Tune and Lube can give customers a ride to work or back home if the location is within 20 miles of the shop.