I plan on using synthetic in my brand new 2007 when the time comes. My mileage is such that I will probably change either every six months or even yearly and never come close to 0% on the meter. Mostly it's my wife around town and this is tough duty for an oil. The Honda also has a small sump and OHC, both also relatively severe in oil service. 0W20 is nearly the same as 5W20 in milder climates and, as mentioned, easier to find. I probably will use Penzoil Platinum or Valvoline Synpower since both are sometimes on sale, unlike Mobil 1. Following my plan, any oil meeting the SM API specs would work fine, even WalMart house brand, but I prefer syn.