There's no real reason I know of to only consdier a 2013 35d. As far as I know, the drivetrain is unchanged from 2009-2013.
As far as high mileage, I'll restate that mine has 242k miles, take care of it and it'll take care of you. They lieke to run at high speeds for long times, as mine sat for around 2 years of it's life, which means it's done about 35k miles a year. as far as I know, they're the original injectors, and mostly everything on the motor is original. Even the harmonic balancer seems to be original, though it's definitely time for a change. Highway diesel is a happy diesel!

funny, my motto in life has always been the same Spyro... If you take care of it, it'll take care of you and thats how I treat everything, wife and all.

As for the highway driving, I can easily do that but sadly, most of it will be city driving (30m/hr/50km/hr or faster) but yeah I have my eye on a well loaded one. I heard the 2013 iDrive system was upgraded for that 2013 year, thats why I was looking at only 2013s but these are new to me since I'm an e53 boy, so far.

Just exceeded 155k miles on mine. In several threads I went into my exoerience with my X5d. I love it. In one thread recently I talked about some of the options I liked. Others chimed in also. Take a look at those threads to learn more.

I'm replacing the suspension and will need new summer tires next year. At some point I'll clean the intake, replace the injectors, replace/clean the intercooler, replace the charge hoses, replace the turbos and install the oil catch can I've had for years.

When I first got my X5, I walked to work but used it a lot for work related travel. That is good for it. Now I live 40 miles from work and I still use it for work related travel. That's great for it. I got mine in November 2014 with just over 71k miles. Now in November 2019 I have 155k on it. Sadly, if you can't put some good miles on it or are going to be short commuting with your X5, I wouldn't recommend the diesel.

We're getting ready to outlay some decent money on repairs it for our 2010 35d. We're at almost 168,000 miles.

$275 to rebuild the SCR tank (active DEF tank I think?). And another ~$800 to rebuild the valve body, new fluid, and replace the seals in the transmission to correct an E clutch monitoring fault that triggers trans failsafe.

So be aware that at the mileage you're shopping, these things can happen. I doubt the trans has ever been serviced in ours so that could be a contributing factor to that failure. But the emissions stuff fails on all of them. Just a PSA for diesel shoppers. Actually the trans failure can happen to any E70 as they all use the GA6HP26Z I believe.

For what it is worth, I think some LCI models got the 8HP. If that matters.

Yes, sorry. I was thinking diesels specifically and then jumped to all inclusive without pausing to let my brain catch up. :D Getting old sucks.

Well, I just learned that the European LCI diesels may have received the 8HP also. I thought they were all 6HP equipped. I'm going to do more research.

thanks for the tips guys. for now i will be keeping the e53 and doing minor repairs but will think more about the diesel but as elluded to, i may wish to stay away as my drive to work is only 10 mins so maybe not good for diesel (yet its no better for a gasoline engine either)

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It's definitely not!

I didn't want to crush your dreams! I bought mine when I walked to work but made sure once or twice a week I drove it on the highway for at least 40 miles. I was also traveling a lot for work and easily averaged 15-20k miles a year there for a bit. That's dropped off some but now I'm driving 80 miles a day to/from work. It's good for it. The worst I did to it was let it sit for almost three months. It did not like that at all.

Really love this truck but getting tired of the emission issues. I so want to delete it but inspection is quite strict in NJ. SCR Cat doesn't regenerate anymore and I already passed extended warranty. Does anyone know of an after market SCR cat converter reliable than the OEM?