My 2014 Mazda CX-9 has 63,000 miles and I faithfully change the full synthetic 5W ... your engines’ increased oil use. Since the car is running normally, chances are it is a minor fuel issue ...

Demands on heavy-duty diesel engine oils have changed alongside engine technology and fuel ... an SAE 5W-type oil and yet the operating protection of an SAE 40 oil. That is a fully synthetic ...