Q. My 2014 Mazda CX-9 has 63,000 miles and I faithfully change the full synthetic 5W-20 oil and filter every six months. I never reach 5,000 miles during the six months or I would change it at ...

“The big difference is that synthetic oil tends to last longer than conventional oil between changes—up to 10,000 miles or more,” Ibbotson says. “Synthetic oil costs about 30 percent more ...

Do one extra oil change per year,” a viewer advised. “Most technicians tell me with full synthetic oil should be good for 7-10k miles.. i never listen to them or neither the car computer..

What would be better or best concerning the interval between oil changes using 5W30 synthetic oil versus regular 10W30 or 10W40 oil? My vehicle is a 1996 Ford Ranger with 143,000 miles on it.

It’s crucial to follow the oil change intervals specified in your vehicle’s owner’s manual. Using the correct type of oil and ...