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  #11  
Old 03-21-2017, 12:25 PM
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The differences in the EGR system, and the additional load (due to weight) on the engine in the X5 does seem to help it edge out the 335D in terms of reliability. Diesels like to work, and obviously it works harder in a 5500lb vehicle.

My car may be an outlier, or maybe the issues are just over-represented on a web forum, but I have 122k miles on what is obviously the original high pressure EGR cooler. My intake is notably full of oil, and the charge pipe is showing signs of oil degradation, but overall the car is doing well. It has an extensive service history, and no-where in it is any mention of any emissions failures. I have noticed some soot buildup on the outside of the low pressure EGR system, which I have not yet been able to dig into.


The obvious solution (for me) is to do the full emissions delete, add an oil catch-can, and replace the windshield trims (to prevent water infiltration into the engine harness connectors), and keep this thing trucking past 200k miles.

I bought this car because my family makes 2x annual trips from northeast TN to central Maine to visit my in-laws. Being able to fit everything, and still return respectable highway fuel economy had my laser sight set on the xdrive35d from go.
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2009 xDrive35D
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Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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  #12  
Old 03-22-2017, 11:31 PM
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Quote:
Originally Posted by daytonatrbo View Post
My car may be an outlier, or maybe the issues are just over-represented on a web forum, but I have 122k miles on what is obviously the original high pressure EGR cooler. My intake is notably full of oil, and the charge pipe is showing signs of oil degradation, but overall the car is doing well. It has an extensive service history, and no-where in it is any mention of any emissions failures. I have noticed some soot buildup on the outside of the low pressure EGR system, which I have not yet been able to dig into.


The obvious solution (for me) is to do the full emissions delete, add an oil catch-can, and replace the windshield trims (to prevent water infiltration into the engine harness connectors), and keep this thing trucking past 200k miles.
Yup you are an outlier lol
no emissions failures at that mileage is pretty incredible. I guess it all comes down to what you get from factory.

that's why I think getting a used x5 with a service history is sometimes better than rolling the dice on a brand new one.

Agree that the emissions delete is the way to go. The replacement cost of the different components is just too high and on top of that the replacement parts seem to not fare any better than the new ones.

on the other hand tho, a lot of components that have gone out on my x5 like glow plugs and fuel rail and injectors. might have been completly preventable if the root cause of the problem -a failed thermostat- had been replaced when it first failed. But the dealer never caught after many many visits
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  #13  
Old 03-23-2017, 06:36 AM
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Originally Posted by Stockx5 View Post
Yup you are an outlier lol
no emissions failures at that mileage is pretty incredible. I guess it all comes down to what you get from factory.

that's why I think getting a used x5 with a service history is sometimes better than rolling the dice on a brand new one.

Agree that the emissions delete is the way to go. The replacement cost of the different components is just too high and on top of that the replacement parts seem to not fare any better than the new ones.

on the other hand tho, a lot of components that have gone out on my x5 like glow plugs and fuel rail and injectors. might have been completly preventable if the root cause of the problem -a failed thermostat- had been replaced when it first failed. But the dealer never caught after many many visits
The failed glow module on mine was the first tip off that there was a thermostat issue, but only because of the shared experience of the membership here. Another good reason not to be an early adopter.

With 121k miles, the cooling system had never been touched either, except when something else was worked on. But the water pump and t-star were original parts, which is a far cry better than the electric water pump on the I6 gassers.
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2009 xDrive35D
Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather
Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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  #14  
Old 03-29-2017, 09:55 AM
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I think drive cycle and use also make a difference. I also agree that the engine in the X5d fares slightly better than the 335d. These engines like to run. I've put almost 40k miles on mine since November 2014 includes long commutes, a 10k mile, 28 day cross-country trip and several trips up and down the East coast and I now am rapidly approaching 108k miles on the odometer. Never a hitch during my ownership but a NOx sensor was replaced with 40k miles on the odometer. However, I notice that when I run it for multiple short trips over a period of time or let it sit for awhile, it clearly does not enjoy that. Got to get those fluids up to temp and exercise it a little bit. The X5d is an amazingly efficient commuter wrapped in a useable SUV-sized package. I hope I have many more 10s of thousands of miles with mine and I am prepared for some of these common diesel items to start dropping out.

ETA: The last 20k miles or so have been with a tune I got through a member here, bawareca. It runs strong and hard and still gets close to 30 mpg on the highway.
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Last edited by josiahg52; 03-29-2017 at 10:15 AM.
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  #15  
Old 03-29-2017, 10:06 AM
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I have a customer, travelling photographer, his '13 35D just turned up 108 k miles. Car looks and drives like brand new, the only problems for the last 50k miles were that someone broke off the nipple off the low pressure EGR valve, and his wife put some gasoline in the tank instead of diesel After the problems have been properly addressed the X is in amazing shape again.
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  #16  
Old 03-29-2017, 10:10 AM
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Quote:
Originally Posted by josiahg52 View Post
I think drive cycle and use also make a difference. I also agree that the engine in the X5d fares slightly better than the 335d
Congrats! Actually I don't think that the X5D's do much better in terms of reliability from what I've read than the 335ds except in the area of carbon build up. The difference being that the X5Ds have a low pressure EGR (post DPF) and high pressure EGR (pre-DPF) where as the 335D only have a high pressure EGR which early on meant for more soot being recirculated into the intake. BMW reprogrammed the EGR duty cycle on the 335D and since then the reports of CBU with less than < 50K miles has nearly disappeared.

One thing I have noticed, recently. I totally removed the EGR system in my car about a month ago (aarod 335d race pipe install). So I had a good chance to look into the intake. My car had nearly 0 carbon build up, and the EGR valve was totally clean. It was amazing, compared to the pictures I've seen of most cars intakes. My car did have a CBU cleaning at 28K (probably didn't know what was wrong), it now has about 54K, with EGR active for most of that. I'll also admit that my EGR cooler was cracked (again) and was leaking exhaust into the engine bay which probably helped reduce CBU as well (except for inside the engine bay)

I suspect a lot of the soot build up is not only the differences in EGR paths, but in fuel quality as well. In the Houston area its a non-clean air attainment zone so we have a minimum of 48 cetane fuel. Most of the country has 40 centane fuel min. The higher the cetane the better the combustion, and less soot. I also run an additive which boosts cetane and adds lubricity. Have been doing so since I purchased the car. The car came from Carls Bad California originally which had 40 cetane fuel.

Last edited by Thecastle; 03-29-2017 at 10:15 AM.
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  #17  
Old 03-29-2017, 12:35 PM
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Originally Posted by Thecastle View Post
Congrats! Actually I don't think that the X5D's do much better in terms of reliability from what I've read than the 335ds except in the area of carbon build up.
I will agree with josiahg52 on all his points, and especially the "fact" that the engine feels and runs better when warmed-up and loaded properly. Just as analogy, many of the problems with the N63 engine are considered to happen because the engine was never broken-in properly. It has so much usable power down low that hardly any regular owner will get to the high load cells of the map for more than a few seconds. Thus, the piston rings may never seat properly, and generally, engine that runs mostly on low and mid-load deteroriates quicker than one that is loaded properly. This is true especially for the diesel, considering that the EGR is closed at the higher load conditions. M57 is way overpowered for the 3 series, and i dont think that the engine can be loaded properly at all. Even on my X5 i dont feel the engine is loaded good in a daily use, even more so the [stupid] transmission likes to downshift for no apparent reason. IMHO the only time the engine is really loaded for a substantial amount of time is when towing, going uphill.

Last edited by bawareca; 03-29-2017 at 03:02 PM.
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  #18  
Old 03-29-2017, 12:58 PM
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ALL BMW engines seem to benefit from the "Italian tuneup".

The CBU issue starting with the S62 (or earlier?) is proof of that. Engines that are run HARD at least reasonably often seem to have fewer issues.
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2009 xDrive35D
Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather
Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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  #19  
Old 03-29-2017, 01:29 PM
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I am going to print off the above and keep in my glove box for the next time one of my "italian tune ups" gets me into trouble.
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  #20  
Old 03-29-2017, 02:43 PM
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Originally Posted by heatmizr View Post
I am going to print off the above and keep in my glove box for the next time one of my "italian tune ups" gets me into trouble.
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2009 xDrive35D
Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather
Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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