Summertime Auto Myths

“If all the cars in the United States were placed end to end, it would probably be Labor Day Weekend.”
- Doug Larson

Popular Mechanics looks at Seven Summertime Auto Myths:

1. "Does turning the heat on really help cool an engine?" Yes. But if you have to do this on a regular basis, then you have an engine problem.
   
2. "Does the summertime require thicker oil?"
   Yes, but not too thick. Modern cars don’t need anything heavier than 10W-30.
   
3. Should I thin the engine coolant for summer? No, always use a 50-50 mix of pure coolant and water to maintain anticorrosion and antiwear additives. Check the label of your coolant to see if it’s been pre-diluted with water.
   
4. Should I buy gasoline in the morning before it expands with heat of day?No, the gas is stored in underground tanks that remain a constant temperature.
   
5. Do open windows use more gas than air conditioning?Perhaps. If you are traveling at highway speeds in an aerodynamic car then the AC is more efficient. For low speeds or blocky cars like SUVs, use open windows instead.
   
6. Can I save money by using low tread tires in the summer? Yes, but only if the road is dry. Tread is necessary to grip the road on raining days. This could be an option for a friend of mine who drives his Corvette only on sunny days. For everyone else, why risk a crash with low tread?
   
7. Is it safe to stay in a car during a lightning storm?
   Yes, the car’s metal bodywork should safely conduct lightning to the ground around you IF you are not plugged into the electrical system with headphones, etc. Keep your arms inside the car!

Bottom Line

Before traveling on long summer trips, get your oil changed and have your car checked. Carry a cell phone so you can call for help if you break down.