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from what i can find the issue was not so much drivetrain damage when can occur while flat towing if you go over 65 but more to do with the battery draining and leaving the customers with a dead battery after a few hours of towing. you need to work out how to power the brakelights and what not that will not be a big drain on the battery. the following is from the 05 mdx owners manual for flat towing. there were no major changes made to the 06 so there is no real reason why it can not be towed flat as well. the issue with the drive train is that without the motor running the trans fluid does not get circulated in the trans and if driven to far and to fast can cause damage to the trans gears. you should be ok if you follow the 05 procedure for towing your mdx. i would make sure to carry a jump box though in case the battery is dead when you get to your destination...
Your MDX can be towed behind amotorhome at legal highway speedsup to 65 mph (100 km/h). Do notexceed 65 mph (100 km/h) or severetransmission damage will occur. Toavoid damage to the 4WD system, itmust be towed with all four wheelson the ground (flat towing).When purchasing a tow bar, makesure you select a reputablemanufacturer. Follow themanufacturer's attachmentinstructions carefully.Perform this procedure every dayimmediately before you begin towing.Otherwise, severe automatictransmission damage will occur.Start the engine.Press on the brake pedal. Shiftlever through all the positionsR,N, D , D , D , 2, 1).Shift to D , then to N. Let theengine run for three minutes,turn it off.Release the parking brake.Leave the ignition switch inACCESSORY (I) position sosteering wheel does not lock.Make sure the radio and anyplugged into the accessory powersockets are turned off so younot run down the battery. 5 4 35If you tow more than 8 hours in oneday, you should repeat the aboveprocedure at least every 8 hours(when you stop for fuel, etc.) Extended Towing The steering system can be damaged ifthe steering wheel is locked. Leave theignition switch in the ACCESSORY (I)position, and make sure the steeringwheel turns f reely bef ore you begintowing.