Other extreme conditions are if you drive in very hot weather or in areas with a lot of blowing dust or dirt, or tow or haul heavy loads all the time. In any of these circumstances, change the oil as often as every 1,000 to 3,000 miles on older vehicles.
http://www.dummies.com/home-garden/car-repair/how-often-you-should-change-your-oil/
All oil looks pretty black within a couple of days after an oil change, so the only way to avoid running on oil that’s so dirty that it becomes a liability is to keep a record of when it was last changed and to change it frequently — as often as every 1,000 miles in extreme operating conditions.
http://www.dummies.com/home-garden/car-repair/how-often-you-should-change-your-oil/
Three thousand miles used to mean it was time to change your car's oil. Now cars can go 5,000 to 7,500 miles or more before an oil change is needed.
https://www.angieslist.com/articles/how-often-should-you-change-your-oil.htm
The type of engine oil, the age and make of your vehicle and driving habits dictate when to change engine oil. According to Ford Motor Company, drivers with typical driving habits that own 2008 and newer models should change their engine oil every 7,500 miles or six months, or whichever comes first.
https://www.angieslist.com/articles/how-often-should-you-change-your-oil.htm
“Change your car’s engine oil every three months, or 3,000 miles.”. At one time, that was standard auto advice. That same advice now feels as outdated as car cassette players and road atlases in your glove compartment. Many cars today can drive 5,000, 7,500 and even 10,000 miles between oil changes.
https://www.angieslist.com/articles/how-often-should-you-change-your-oil.htm
Meanwhile, drivers should change the oil in vehicles 2007 and older every 5,000 miles or six months, or whichever comes first. Drivers with less typical driving habits should change engine oil every 5,000 miles or six months for vehicles 2008 and newer, and every 3,000 miles or three months for cars 2007 and older.
https://www.angieslist.com/articles/how-often-should-you-change-your-oil.htm
How often to change oil can be dependent on the car manufacturer — some manufacturers suggest that oil be changed every 7,500 miles or more, but that’s based on optimum operating conditions, and the manufacturers are the ones who get to sell you a new vehicle if your old one wears out prematurely.
http://www.dummies.com/home-garden/car-repair/how-often-you-should-change-your-oil/
Drivers are often stumped how often to change their oil. While the new standard is 5,000 miles, read more to see what the right number is for your car.
http://www.dummies.com/home-garden/car-repair/how-often-you-should-change-your-oil/
“Change your car’s engine oil every three months, or 3,000 miles.” At one time, that was standard auto advice. That same advice now feels as outdated as car cassette players and road atlases in your glove compartment.
https://www.angieslist.com/articles/how-often-should-you-change-your-oil.htm
The traditional recommendation is that you should change your oil every 3,000 miles or 6 months, whichever comes first. However, the new standard is that you can typically change your oil every 5,000 miles worry-free (especially if you are driving a relatively new car or are in “optimal operating conditions).
http://www.dummies.com/home-garden/car-repair/how-often-you-should-change-your-oil/
how often do you need to change the oil in car
Change your car’s engine oil every three months, or 3,000 miles.