I have been monitoring this site for some time. I have developed my own opininion based upon the weath of info available on this site. I do have questions though. I have done my own research by questioning various technical service reps from different companies. I have found that the Chevron-Texaco reps to be the most helpful and knowledgeable. I have also questioned the reps from Lubrizol additives. They were also very helpful. My question is: Since group II/II+ base oils are better, and require less additives for anti-oxidation and viscosity, Does the TBN number really reflect on the quality of the motor oil in question, since it may need less additives to do the job. Also, I recently spoke to tech services at Redline. The fellow told me that with the minimum difference in wear metals found in different analysis's of used motor oils, That UOA's really dont serve a purpose for the passenger car. They only really benefit an owner of fleet vehicles who are trying to maximize their change intervals. BY the way, the research I have done, has shown that the real way to go to maximize the cost vs. performance value, is to go with a group II/II+ oil such as Chevron/Texaco. I have also used an hour meter on my vehicle. My average speed is 35.24 MPH. I drive very short trips, with many cold starts. Based upon the research I have done, A good place to change is at 150 hours, which equals 5286 miles, so I change at 5000 miles with havoline just to be safe. I have 185,000 miles on this vehicle and its oil consumption is less than 1/2 qt. In the 5,000 miles, with Havoline 5w30. This vehicle I used for deliveries.