Three models comprise the S-Type range, distinguished primarily by their engines. Each comes with rich leather upholstery and all the other features associated with a premium luxury car. The S-Type 3.0 is powered by a 235-horsepower 3.0-liter V6. The S-Type 4.2 comes with a powerful, 300-horsepower 4.2-liter V8. The high-performance S-Type R gets a supercharged version of the same 4.2-liter V8 and produces 400 hp. All models come with the six-speed automatic transmission.For 2006, the Jaguar S-Type gets a power increase and some other minor upgrades.