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  #1  
Old 03-16-2016, 04:52 PM
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Model year changes in 35d diesel engine

All,

I'm very interested in buying an e70 X5 xDrive35d in the not-so-near future. I'm trying to research as much as possible, as I always try to do for a major purchase.

What I'm having trouble finding is specific information about the changes to the diesel engine throughout the production years.

It looks like, globally, the diesel engine changed a bit during the facelift, but in the US market, it "remained unchanged".

However, I'm seeing lots of threads and reports about the emissions systems on the earlier engines being much more troublesome than the later engines.


Is this a simple matter of "later production = bugs worked out" or are there any advantages to the earlier engines?

Is it all in peoples heads?


I've tried to search on the topic here, but most of the threads that come up are from 2013 when everyone was excited about the facelift changes and there was lots of hearsay with little fact.


Thanks in advance!
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Old 03-16-2016, 11:41 PM
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The earlier versions of the diesels had more issues including failing swirl flaps where hardware would end up destroying the engine. For the most part the diesels used for the E70 X5 platform are pretty reliable. As you researched however, the weak point is the emission systems. The most common issues are Urea tank sensor failure, O2 sensors needing replacement 50-75k, vacuum hose replacement, and carbon buildup due to the direct injection system. When you really study these problems, you might have to replace each once during your ownership from a long term perspective.

I did a lot of research before buying my X5d and I have zero regrets. I first started looking at the 4.8i but quickly learning that valve stem seals and general leaks could quickly get costly and annoying. Also, I was surprised to read that when the releases the 35i, it was comparable with regards to performance yet better on gas. After that I started looking at expanding my budget and searched the LCI 50i models. Was really close to pulling the trigger as the power was intoxicating but given the number of issues tied to that engine and the long term reliability likely to be very questionable, I crossed that option off the list. From there my only option was the diesel and after driving one it was the perfect combination of power, reliability and gas mileage for what I wanted. Finding a well optioned one will take time but it's worth it. Took me 6 months to find mine but haven't looked back since day one.
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Old 03-17-2016, 01:25 AM
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Mid-year 2011 was the LCI (facelift)

2011 X5 LCI (Facelift) - Official Pictures, videos, technical details and wallpapers

Aside from that, there are no documented changes unique to the diesel.
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Old 03-17-2016, 07:21 AM
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IMHO there were no major changes in the diesel engine for the model run. The later models have just as many emissions issues as the older ones. Other than the LCI update, the only major difference was the switch away from the gen 1 ccc nav after 09. It is really bad (especially the backup camera) and may people pay thousands of dollars to switch it out.

I spend a year shopping and got frustrated with the lack of options in the newer diesels. It was very easy to find a loaded 09 where most of the 2012s were base models.
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Old 03-17-2016, 07:57 AM
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Thank you all for the responses.

I guess I ended up confusing myself on the LCI year, I knew it was 2011 and lost track of that somewhere.


The 09 models certainly do seem plentiful. I'm not real worried about the CCC system, I've already been researching upgrading my e38 to NBT, so I'm sure that would be much less involved.



One thing I have noticed is that the EPA highway economy for the 35d went from 28mpg at introduction to 26mpg post LCI. But now the EPA lists 26mpg for all years. I wonder if that's just something that changed in the testing. But the odd thing is, anecdotally, the 2009/2010 model reviews I've been looking at on YouTube say that they return over 30mpg on trips, but the similar reviews Post-LCI typically fall between 26-28.

There is a very clean looking 09 not far from me for sale right now. If they dropped the price below KBB I'd be very interested.

But I will likely wait until the LCI models hit the ~$15k mark for an "average" example and plan on spending a little more to find a nice one.
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Old 03-17-2016, 12:55 PM
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Plan on waiting quite a while for them to hit $15k. A decently optioned 35d will at least fetch mid $20k. You might be able to find a base model higher mileage example in the low $20k range. If $15k is the budget you may want to reconsider as you will for surely be owning a BMW outside of warranty which means you need to budget repair costs as well.
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Old 03-17-2016, 01:16 PM
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Quote:
Originally Posted by Socale39 View Post
Plan on waiting quite a while for them to hit $15k. A decently optioned 35d will at least fetch mid $20k. You might be able to find a base model higher mileage example in the low $20k range. If $15k is the budget you may want to reconsider as you will for surely be owning a BMW outside of warranty which means you need to budget repair costs as well.
Kbb on a low mile 09 is already down to 16k.

I'm an avid DIY'r so warranty doesn't even play into it for me.
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