The 3.5-liter V6 in the 2007 Lincoln MKX is smooth until pressed into high rpm duty, where it gets a little raspy. The engine is complimented by an excellent six-speed automatic transmission that provides reasonable acceleration from a standstill, holding the lower gears to prevent premature up shifts. Without the constant up-&-down hunting sometimes experienced with an automatic, this gearbox feels almost intuitive in its ability to be in the right gear at the right time. A request for more acceleration is quickly addressed with a downshift from sixth to fourth or even third when necessary.