Abstract
Last autumn BMW has launched the facelift of its X5 series. One of various modifications was the replacement of the V8 powertrain by the new 4.4 ltr. Valvetronic engine — well known from the 5, 6 and 7 series — and by the 6 speed ZF automatic gearbox. The new BMW x-Drive 4 by 4 technology enables with an electronically controlled multiplate wet clutch in the transfer box an extremely fast and continuosly variable distribution of the drive torque between the front and rear axle within milliseconds. As the successor of the top model X5 4.6iS the Valvetronic eightcylinder engine has been increased in displacement to 4.8 ltrs and has been optimized by power improving modifications at the base engine as well as at the air intake system and exhaust system. Since April 2004 this powertrain is offered as the new top model X5 4.8iS.
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