I am participating in the Pennzoil UOA program. My first UOA was with SuperTech Full Synthetic, 10k miles, and was done right after a round trip to Louisiana. My current fill is with PUP 5w/20. Likewise, I just returned from a trip to Louisiana. I only have 9k miles. Will doing a UOA one thousand miles early make a difference for comparison purposes? With consistent Sub-Zero temps, I'm thinking a 0W/20 might be in order ASAP.