I bought my 2003 TL Type-S a few months ago, and have since changed my oil and filter with the 5W-20 blend that I bought at the Acura dealer. I drive the car like it was meant to be driven - hard and fast, so I'm considering using a synthetic oil. Previously in other vehicles, I've used Mobil One or Syntec, but neither of those comes in a 5W-20 formulation. That said, I've heard varying opinions as to which synthetic would work best in my car. Some say that Honda specifies 5W-20 just to keep their CAFE (Corporate Average Fuel Economy) ratings up. Is this the only reason? Can I just use Mobil 1 5W-30 synthetic in my Acura, or are there unforeseen consequences to doing so??