The prospect of being denied engine service under warranty because of using a non-API oil or an oil with viscosity other than what is recommended is a constant theme here. I believe that it drives some decisions about oil choice that may not be optimal, based on driver habit, environment, vehicle usage, etc. Let's see how much of a real-world issue it is here, and how much is it mythology.
1. Have you ever been denied warranty service because you used a non-API oil?
2. Have you ever been denied warranty service because you deviated from the viscosity recommended/required in the manual?
3. Has a dealer ever questioned what viscosity or brand of oil you used for the purpose of determining your compliance with the manual?
1. Have you ever been denied warranty service because you used a non-API oil?
2. Have you ever been denied warranty service because you deviated from the viscosity recommended/required in the manual?
3. Has a dealer ever questioned what viscosity or brand of oil you used for the purpose of determining your compliance with the manual?