[Belsy]

How many are running regular top grade oil vs. synthetic?? What are the reasons we flip over synthetics? Does switching from one to another present a problem especially on higher mileage cars, when you are not sure what previous owners may have used and how often?
As the cars are traded around and add the dealer owned cars, who can be sure what schedule and product was used?? What is the best non synthetic oil to use?

Just a concern and light poll to rest any fears.
Please respond with any thoughts!!