My car is a 2008 Mustang V6 and my next oil change is at 50,000 miles. I am going to try a new oil to me because it was on sale at pep boys, royal purple. I don't want to start a like or dislike thread about oil products, I just have a question about the whole analysis idea. Whats a good way to get an idea of how my engine is doing? Should I do two consecutive UOA in a row, or do a VOA and one UOA? Im not looking to test each oil change, but I would like to know the health and state of my engine. Thanks and I appreciate the responses.