After considerable reading on a well-known oil review website, I decided to go with Pennzoil Ultra 5w30 and a Purolator filter for the last oil change. With that being said, Mobil 1 is currently on sale at my local parts store. $32.99 for a 5-quart jug and a Mobil 1 oil filter. Add another $8-$9 for the sixth quart and that price is hard to beat. When I purchased the Pennzoil for the last change, they had a $10 mail-in-rebate going on. I just received it in the mail yesterday along with a $5 off coupon for my next Pennzoil purchase. If you're willing to bounce between a couple of brands, then you can save a little coin if you shop the specials at your local parts stores. Since I'm willing to use Mobil 1 or Pennzoil Ultra, it's almost guaranteed that at least one of them will be on sale at some point during my 4-5k mile interval.