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naturist's avatar
Jul 12, 2014

BMW X5 35d as tow vehicle

I've been towing a 21 foot TT the last 6 years with a Jeep Liberty CRD. The trailer is 3860 lbs empty, and around 5,000 lbs loaded for a trip. This is at the Jeep's official weight limit, and while it towed fine, even dragging that trailer over the Rockies at 11,000 feet on I-70 west of Denver, you could tell the trailer was back there.

The Jeep being at 185,000 miles now, we decided to get a new/second tow vehicle, looking to the future. We chose a BMW X5 35d, and took it on it's maiden voyage a couple weeks ago. This is my report on that trip.

This BMW has an all-aluminum 3.0 liter, 6 cylinder, twin-turbo diesel engine. It puts out 425 ft-lbs of torque through a 6 speed automatic transmission. In the US, BMW supplies a hitch rated at 6,000 lbs, although in Europe the official hitch is a US made Invisihitch rated at 7,700 lbs. I chose an aftermarket Curt hitch, also rated 6,000 lbs.

For the maiden voyage, we returned to one of our favorite nearby campgrounds. Although the tow was only about 25 miles each way, it did take us over a few hills, and I can report that the BMW's engine is enough stronger, and the suspension enough better to transform the feel into a "couldn't tell it was even back there."

The BMW's fuel consumption is pretty much the same as the Jeep. EPA said 21-26 mpg for the Jeep, 19-26 for the BMW. Both do mid-twenties for me, although I've gotten as high as 34.8 in the Jeep. I haven't had the BMW long enough yet to find out if BMW's claim that it is possible to get 31 is true.

I can tell you that the BMW is much quicker, and I'm sure that the EPA's lower city mileage rating probably reflects the temptation to use that "quicker" from time to time. I will be claiming a need to "blow the soot out" from time to time to the DW.

Interestingly, BMW's approach to DEF is to tell owners that the dealer will take care of it when you take it in for an oil change, and not to worry about DEF unless you simply must. Given that towing that Great Wall will cut through fuel at about twice the normal rate, I bet I'll have to top off the DEF tank between oil changes.

The other big difference I've noted is that the BMW has no noticeable turbo throttle lag. Stepping on the go-pedal gets instant response, whereas the Jeep takes a couple seconds to get going. Oh, and the BMW transmission shifts so smoothly you can't feel gear changes, unlike the jeep which lurches from time to time.

For those considering towing a small trailer with an SUV, you might consider the X5 on your list. Though on the expensive side, it is a very capable TV.

18 Replies

  • For the record my german suv has never had a problem as of yet and has 70k mi on it, but my 2010 Dodge PU that is now gone had to be towed out of my driveway twice and only had 26k mi on it.
  • dodge guy wrote:
    Good for you! wait till you get some miles on those German cars/suv`s. they will kill you in upkeep and repairs!


    Yeah, I keep hearing that. And I suppose we'll find out ourselves.

    We went with the X5 over competitors for one simple reason: somewhere I read a study that claimed that among the likely competitors in that segment of the market, the VW Taureg TDI, the Mercedes ML350, the Jeep Grand Cherokee, the X5, and a couple others I don't recall right off, the X5 was the least expensive to repair (now isn't that scary for owners of the others?).

    Our other two vehicles currently are a VW Jetta TDI and a Jeep Liberty CRD. Previous was a Chevy Astro AWD. For what it is worth, all three were expensive to maintain, with the Jeep at the top of the list. Least reliable, most expensive car I've ever owned when it came to maintenance issues. That one is US (built in Toledo, Ohio) with an Italian engine.

    And for what it is worth, the X5 was built in Spartanburg, South Carolina.

    My personal opinion is that the more complex they are, the less reliable they are. On that score, the X5 is definitely the most complex. I'll have more data for ya in a 100,000 miles or so.

    rwbradley wrote:
    This is an interesting topic.


    You are welcome. And thank you for YOUR report.

    rwbradley wrote:
    The only criticism I would have is there seems to be a spot at abt 95-100km/h where gas consumption increases significantly, which is an issue for freeway driving, but driving on US2 from Lake Placid to Bar Harbor for close to 8 hours thru mountains, I would say my mpg barely went down 20%.


    There is no doubt that mileage starts to drop rapidly above 55 mph/95. Wind resistance is an exponential function. While you can get some improvements at certain speeds above that with gearing, above 65 mph/105 kph, things get expensive quickly.

    rwbradley wrote:

    It shows that you do not need a big muscle Pickup truck to pull a small to medium TT, that many modern SUV's and Sedan's with a V6 are up to the task if paired with the right trailer.
    The owner of the dealer I went to writes a regular article in an RV magazine on hitch setups. He has done a few extreme ones (ie Mini Cooper pulling an Airstream Bambi), but the articles show that there are more factors than just towing capacity/horsepower of the TV and that if paired right you can pull a decent trailer with anything from a Taurus to a Porsche. If you are interested in reading the articles:
    http://www.canamrv.ca/hitch-hints/


    There's a guy on the VW TDI forums who uses an old Jetta TDI as a tug around his place for dragging a lot of huge loads back and forth. That Jetta is all of 90 hp, and clearly incapable of dragging the loads he uses it for down the road, but at 5 mph around his business, it works fine. And it is small and maneuverable. And cheap to run.
  • Good for you! wait till you get some miles on those German cars/suv`s. they will kill you in upkeep and repairs!
  • Great report and info... thanks OP!

    My wife's car a few years back was an X5 (gasser) and without a doubt that was the nicest all around vehicle I've ever driven. It is the perfect size to be comfortable yet still compact enough to fit into tight places. It has great visibility, the AWD is outstanding, the brakes were great and every other aspect of vehicle was just top notch.

    We ended up having twins which put us one seat short in the X5 so we now have a Honda Odyssey. We sure do both miss that X5. I love to see the diesel engines trickling (albeit very slowly) into vehicles in the US. Most Americans still associate diesel with the stinky, smoke billowing old "rattlers" of the mid 1980s.

    I'm up into 3/4 ton land to tow my TT beast but when I downsize someday into a smaller TT I'd have to take a serious look at that X5 diesel. That looks like a pretty ideal setup.
  • This is an interesting topic. I just purchased a Santa Fe XL (V6) and a 21' Hybrid TT. The TV is rated for 5000/500lb towing capacity, the TT was rated 3500 dry/ 5000lb full. I had a local shop here who specialize in doing custom hitch work install a hitch, reinforce it, setup sway and WD, break controller, transmission cooler etc.
    I just drove 2000 miles with this pair from the Toronto area to Lake Placid to Bar Harbor to PEI and back thru Quebec. I was amazed on how well it handled. I did not once have to floor the gas going up any mountains in Vermont, its handling and control was outstanding and stopping power was excellent even in extreme conditions ie down a mountain or in torrential rain in Montreal rush hour. The only criticism I would have is there seems to be a spot at abt 95-100km/h where gas consumption increases significantly, which is an issue for freeway driving, but driving on US2 from Lake Placid to Bar Harbor for close to 8 hours thru mountains, I would say my mpg barely went down 20%.
    It shows that you do not need a big muscle Pickup truck to pull a small to medium TT, that many modern SUV's and Sedan's with a V6 are up to the task if paired with the right trailer.
    The owner of the dealer I went to writes a regular article in an RV magazine on hitch setups. He has done a few extreme ones (ie Mini Cooper pulling an Airstream Bambi), but the articles show that there are more factors than just towing capacity/horsepower of the TV and that if paired right you can pull a decent trailer with anything from a Taurus to a Porsche. If you are interested in reading the articles:
    http://www.canamrv.ca/hitch-hints/
  • We have a Mercedes GL350 with V6 dsl. I have never towed anything other than enclosed cargo trailer but it does it just fine but mpg does drop significantly when towing. It consistently gets 25+ mpg when not towing and i have got as high as 31. All this from a 7 passenger awd suv. I have never had to add DEF between oil changes. My only gripe with it is the service cost which is done every 10k mi.