I know there has been a lot of posts regarding the use of synthetic oil and expensive filters. Today, I decided to treat my Taurus to the best I could find, just because I love her. It came down to Mobil1 filter and oil or, K&N Filter and Pennzoil Platinum. I believe K&N and Mobile1 filters are made by the same Manufacturer? AZ didn't have Mobil1 5W20, so I went with the K&N. I also have their air filter (I always put one in on the way home from the dealer. Actually, this time I put it in at the dealer while they were doing my free tint job.) The K&N was a buck or two more than the Mobil1 filter. No big deal. I have great hopes in the Pennzoil Platinum. Yeah, it's a well known brand. 5 Quarts took her right to the top of the dip stick indicator.