I recently purchased a new Ford Focus sedan and need some oil opinions. I will be using this car for my daily commute of 50 total miles per day. 80% of my drive is open highway, 20% stop and go. Vehicle is an auto tranny, average temps in my area are fairly mild year'round. My commute may become much longer in the future. I want this little car to last a long time. I will ONLY use either Pennzoil Platinum or Motorcraft Full Synthetic in the 5w-20 weights and Motorcraft filters. I like what I've read about the Motorcraft oil but I am also impressed with the PP having a possibly stronger detergent quality. Please stick to only these two oils and give me any opinions as to what your choice would be....and why. Thanks. Oops.....almost forgot. My OCI will be 6 months or 6k miles.