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 ...

Last week we explained the basics of motor oil, from viscosity to additives and ... at Ford said they’ve switched to lighter weight 5W-20 oils in order to trim fuel consumption.