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In my 420G Getrag 6 speed I run Royal Purple Synchromax.I have changed it out twice since I have owned the car.50K on the car now and I bought the car with 22K on the odometer.I dumped all fluids when I bought it and 1500 Miles ago dumped the transmission Fluid and I just changed out the differential ( put a M5 diff in the car ) 500 miles ago.Engine oil 3-5K . Fluids are cheap.
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