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  #1  
Old 05-28-2015, 10:54 AM
ninja_zx11 ninja_zx11 is online now
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(Solved)X5 35D Rising oil level and oil analysis

Hello friends, Vehicle is 2009 X5 35D with 94000 kms.Bought it last year CPO from the dealer and had 75000 kms.I changed my oil (put castrol slx professional 5w30 from the dealer) at around 86000 kms as per Idrive's notification.At that time i think oil had around 18000 kms (11000 miles).While changing oil i noticed that oil level was around 4~5mm (3/16") higher than the max mark but i never got high oil level warning from the oil sensor.I sent oil for analysis and it showed high iron and they tested fuel dilution 1%.But lab used just flash test which i think is not accurate way of testing.

So after running around 6300 kms(4000 miles) i took a sample from dipstick and sent it for analysis again.This time i asked for Gas chromatography fuel dilution test and it came with 6.3 % of diesel dilution and iron content of 58 in the oil just after running 4000 miles.I am suspecting problem with injectors or high pressure pump leaking diesel into the oil.Any suggestions please? CPO expiring in september this year. thanks

Report is showing my previous test as well.
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  #2  
Old 05-28-2015, 11:25 AM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by ninja_zx11 View Post
Hello friends, Vehicle is 2009 X5 35D with 94000 kms.Bought it last year CPO from the dealer and had 75000 kms.I changed my oil (put castrol slx professional 5w30 from the dealer) at around 86000 kms as per Idrive's notification.At that time i think oil had around 18000 kms (11000 miles).While changing oil i noticed that oil level was around 4~5mm (3/16") higher than the max mark but i never got high oil level warning from the oil sensor.I sent oil for analysis and it showed high iron and they tested fuel dilution 1%.But lab used just flash test which i think is not accurate way of testing.

So after running around 6300 kms(4000 miles) i took a sample from dipstick and sent it for analysis again.This time i asked for Gas chromatography fuel dilution test and it came with 6.3 % of diesel dilution and iron content of 58 in the oil just after running 4000 miles.I am suspecting problem with injectors or high pressure pump leaking diesel into the oil.Any suggestions please? CPO expiring in september this year. thanks

Report is showing my previous test as well.
The iron can be ignored - pretty usual reading. Fuel dilution mostly comes from the post-injection for DPF Regeneration (read up on it). If you have many shorter trips, the regens can get interrupted and not complete, which forces another, etc., which causes excessive fuel dilution. The HPFP has nothing to do with fuel dilution, btw. Another thing that can cause trouble with dilution is excessive BioDiesel - BMW specs 5% as ok and nothing higher than B7; what are you running up there in BC?

I might also suspect sample contamination - the CVV empties into the dipstick assembly, and excess blow-by (containing unburned fuel) might accumulate there. Try a sample from the oil drain (better do it cool so you can re-plug it fast!)
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  #3  
Old 05-29-2015, 02:03 PM
ninja_zx11 ninja_zx11 is online now
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Quote:
Originally Posted by floydarogers View Post
The iron can be ignored - pretty usual reading. Fuel dilution mostly comes from the post-injection for DPF Regeneration (read up on it). If you have many shorter trips, the regens can get interrupted and not complete, which forces another, etc., which causes excessive fuel dilution. The HPFP has nothing to do with fuel dilution, btw. Another thing that can cause trouble with dilution is excessive BioDiesel - BMW specs 5% as ok and nothing higher than B7; what are you running up there in BC?

I might also suspect sample contamination - the CVV empties into the dipstick assembly, and excess blow-by (containing unburned fuel) might accumulate there. Try a sample from the oil drain (better do it cool so you can re-plug it fast!)
Thanks for the reply.But i will still have it documented by the SA just in case for the future because my warranty is expiring soon.So like earlier bmw diesel engine, on M57 HPFP won't dump fuel from its shaft in case seals leak?
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Old 05-29-2015, 02:39 PM
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Originally Posted by ninja_zx11 View Post
Thanks for the reply.But i will still have it documented by the SA just in case for the future because my warranty is expiring soon.So like earlier bmw diesel engine, on M57 HPFP won't dump fuel from its shaft in case seals leak?
I suppose it's remotely possible that the front seal of the HPFP's pump shaft could fail and leak diesel into the crankcase, but I have never heard of such a situation.
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  #5  
Old 05-29-2015, 02:48 PM
ninja_zx11 ninja_zx11 is online now
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In BC we have 5% BD but i normally fill it up in Washington state just across the border.I couldn't see any info at the pump in WA.DO you know what % of BD does WA chevron carry?
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Old 05-29-2015, 04:35 PM
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Quote:
Originally Posted by ninja_zx11 View Post
In BC we have 5% BD but i normally fill it up in Washington state just across the border.I couldn't see any info at the pump in WA.DO you know what % of BD does WA chevron carry?
Depends upon the station, but usually 5%
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  #7  
Old 05-29-2015, 04:36 PM
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BB_cuda BB_cuda is offline
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Floyd, confused about your statement that CVV empties into dipstick assy? Can you elaborate please? As you likely know, I drive an E90. I run a catch can on the CVV's output gases to reduce oil getting to intake. Does E70 do something different? Thanks

Last edited by BB_cuda; 05-29-2015 at 04:38 PM.
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  #8  
Old 05-29-2015, 10:00 PM
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floydarogers floydarogers is offline
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Originally Posted by BB_cuda View Post
Floyd, confused about your statement that CVV empties into dipstick assy? Can you elaborate please? As you likely know, I drive an E90. I run a catch can on the CVV's output gases to reduce oil getting to intake. Does E70 do something different? Thanks
Possibly I'm wrong (wouldn't be the first time.) But all the CVV/PCV valves on past BMW engines have had the vent integrated with the dipstick. Haven't really checked the M57.
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  #9  
Old 05-31-2015, 04:46 PM
sirbikes sirbikes is offline
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If you remove the dpf and code it out, no more post injection. Does that mean you can run 100% biodiesel?

Quote:
Originally Posted by floydarogers View Post
The iron can be ignored - pretty usual reading. Fuel dilution mostly comes from the post-injection for DPF Regeneration (read up on it). If you have many shorter trips, the regens can get interrupted and not complete, which forces another, etc., which causes excessive fuel dilution. The HPFP has nothing to do with fuel dilution, btw.
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  #10  
Old 08-04-2015, 09:08 AM
ninja_zx11 ninja_zx11 is online now
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Continuing this issue in this thread:
http://www.bimmerfest.com/forums/sho...=806965&page=2
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  #11  
Old 06-23-2016, 09:15 PM
ninja_zx11 ninja_zx11 is online now
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Update:
After driving 7600kms with new HPF pump,i can confirm that it was the High pressure pump leaking diesel into the oil.I checked my oil level today via dip stick and for the first time instead of going up,it actually went slightly lower(if not same) than what i recorded 7600 kms ago.Before changing the HPFP,it was rising quite a bit after driving 7~8k Kms.
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Old 06-25-2016, 03:53 AM
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Quote:
Originally Posted by ninja_zx11 View Post
Update:
After driving 7600kms with new HPF pump,i can confirm that it was the High pressure pump leaking diesel into the oil.I checked my oil level today via dip stick and for the first time instead of going up,it actually went slightly lower(if not same) than what i recorded 7600 kms ago.Before changing the HPFP,it was rising quite a bit after driving 7~8k Kms.
If oil level is rising it is most likely due to fuel contamination via the Fuel Injection system which operates at a much higher pressure than the lube oil.

Smelling the oil you might detect the smell of diesel fuel, but a simple viscosity test would confirm fuel dilution.

It certainly isn't good for your engine bearings to have fuel dilution of the lube oil.

At 100k my car uses about 1 quart of oil inbetween the 13k OCI, so every 6-7k I add a quart.

If it were to rise I would be very concerned.
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