On Monday I traded my 2007 Mazdaspeed 3 in for a 2004 Toyota Sequoia. We needed more cargo room for, of all things, the dog. Using my lifted 1989 4Runner wasn't working because he wouldn't jump in and my wife couldn't lift him in, I could do it IF he was willing. He's a 140+ lb rottweiler so he can be the boss when he wants. In any case, The Sequoia has about 74,500 miles on the 4.7 V8 and appears to be in nearly perfect condition. I had it inspected and the mechanic said that both the transmission and engine appeared to be well maintained. He specifically said that when he looked into the block through the oil fill hole it looked brand new. My wife will be starting a job in July where her commute will be about 30 miles each way to work and very little of it will be stop and go in town driving. I'm planning to run either Pennzoil Platinum or Valvoline Maxlife 5w-30 or 10w-30 with Mobil 1 filters. I'm thinking that 7,500 mile OCIs should be conservative yet cut out every other change compared to a 5,000 mile OCI. Any thoughts?