換不換 或者 換沒換 確實是個問題, 找正規的 shop (我是到dealer or walmart )花幾十塊錢買個安心

Many automakers have oil-change intervals at 7,500 or even 10,000 miles and 6 or 12 months for time.

“Your owner’s manual has more detailed information about your car than any mechanic does,” Ibbotson says. “Don’t get talked into too-often oil changes. Follow the manual and your car’s engine should stay well-lubricated and perform well.”