An outstanding feature of the car is the all-wheel-drive system. The more slippery the road, the more pronounced is its advantage over conventional two-wheel-drive systems. The car has an all-new 3.0-liter DOHC 24-valve aluminum V-6, which replaces an iron-block straight six of identical displacement. With Toyota's VVT-i variable-valve-timing system operating on cams, plus direct injection, plus a formidable 11.5:1 compression ratio, the new six generates 245 horsepower and 230 pound-feet of torque, compared with 220 of each for its predecessor. The new V-6 is bolted to an equally new six-speed automatic transmission, featuring manumatic shifting and an electronic brain that does a good job of avoiding excessive hunting, particularly in uphill runs. It also has an eardrum-pounding, wallet-smashing Mark Levinson audio system, its 11 channels of sonic wash flowing through 14 speakers, Rain-Sensing Wiper package that includes adaptive front lighting and headlamp washers (standard on the GS 430); a rear spoiler; and all-season run-flat tires. Luxurious amenities, exquisite quality, and remarkable technology--these are all the things that make up a Lexus. Partstrain likewise strives to preserve these qualities in delivering only the best Toyota Replacement Parts, Performance Parts, OEM and Aftermarket Parts. The Sports Luxury model tested here adds satellite navigation, a sunroof, intelligent cruise control, parking sensors and an excellent Mark Levinson stereo system. Operating full time, the GS300's all-wheel-drive system features a planetary gearset and a wet, multidisc clutch to couple the primary drive wheels, at the rear, to the front. The standard torque split is 30/70 front to rear, but the system's electronic brain can vary that to 50/50, making its judgments based on various driver inputs such as throttle angle and steering angle, and vehicle data such as wheel speed and yaw rate.
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