Fuel in oil test result

[Jim W]

The above tech bulletin actually states "calculated" fuel % above 5%... everything is calculated, there is no magic sensor to establish fuel/oil percentages.

No one is saying there is a sensor. Both Ken and Wygate are looking for information from Dodge that sates the fuel dulition should not be above 5%. This was my reason for usng this bulletin from another post.



If I remeber correctly, no where in this thread did anyone state that there is a sensor that checks on fuel in the engine oil. The discussion is what cause this and the results.



So what are you trying to say?



Jim

 

[KLauber]

The doctors could find no issues with the injectors but a slightly out of spec fuel actuator was replaced. Doctor said too many interrupted regens (grocery gettin) or long idle times to blame for fuel dilution. I did have 2 days where i was idling the truck to stay warm on a cold windy day at work. It would kick into high idle speed on occasion. I will provide an update next oil sample to how things are and also will manage my grocery gettin!

Ken

 

[roadrunnerjon69]

oil test results

Doesn't the Dodge service schedule call for oil and filters at 7500, and fuel filters at 15,000? I run Royal Purple and change mine at 6000 and 12000 respectively...

 

[Jim W]

Doesn't the Dodge service schedule call for oil and filters at 7500, and fuel filters at 15,000? I run Royal Purple and change mine at 6000 and 12000 respectively...

This is from the Cummins Maintenance home page on the 6. 7L engine for the Dodge Ram truck, and I quote.



"The maintenance interval has changed over the years on several items, however, the valve lash adjustment remains the same at 150,000 miles (240,000 km) and the fuel filter replacement remains at 15,000 miles (24,000 km). The oil change interval is 7,500 miles (12,000 km) and is duty cycle based. This interval will vary because the mileage will fluctuate based upon how the driver utilizes the vehicle. This engine uses an oil change monitoring system which will display a message on the vehicle information center that alerts the driver to change the oil. "



The key being is the wording "Duty cycle based" to me that is. If you are not working the engine hard enough and you are doing a lot of stop and starts the oil will need to be changed more often. This is do to the partial regens which take place and will allow more fuel to enter the engine oil from the partial regens.

Jim

 

[TCDiesel]

I have NEVER seen the window sticker stating commercial use ONLY,Changing oil in modern day engines @3-5K is stepping back wards 30+years. 10% dilution is out right disgusting @5k ,Who's, at fault I believe Cummins is the culprit here Bosch specifically designed the injection system to operate during use. Both Dodge and Cummins have failed to alert buyers of this know issue. Unless you plan on spending $4k to strip it and void your warranty for city driving. Unless GM/Ford/Dodge bring something worthy to the Pavement My Next truck will be Gas. I cannot bring Myself to spend $8k more for trans/Cummins combo, for 3k service and mileage that is only 5% better then Gas.



On Edit: I have 2008 That is strip and has twins, 38k trouble free miles. The oil is as clean @5k as My 2003, My 05 is dark with 100 miles of changing but has Never had above . 06 with current milage @41k, My 03 122K

 

[TDickerson]

Very Concerning.

,Changing oil in modern day engines @3-5K is stepping back wards 30+years. 10% dilution is out right disgusting @5k.



I will have to highly agree with this. I sold my 97, 2 years ago, since I was going overseas with the intention of getting me a new diesel when I come back next year to pull my travel trailer. I have been reading so much about the fuel dilution problems that I am really getting concerned about buying another diesel. I always changed my oil and filters religiously in my 97 at the intervals stated in the manual. I'm getting older now and changing my own oil is getting more difficult so I will be relying more on shops now. Don't get me wrong, I don't mind paying for the service, but this fuel dilution thing, because of the regenerations, that is causing short oil changes seems ridiculous. Forget about using a good synthetic oil and dumping it out every 2-4K miles. Seems taking a trip with my trailer is revolving more around getting the oil changed in the truck than enjoying the vacation. Oo.

 

[Mikey-KE7LBB]

Probably the wrong thread to post...But, still good info for all!

I had 62%! I will say It is still running fine at this point w/ 25k on the ticker. Oil pres still well within spec and full warranty is in place.

Was oil pressure checked using a mechanical gauge??? The reason I ask this ?? is the fact that the "gauge" on the dash, is really just an idiot light that is operated off of a 6 psi switch! And that the pressure reading is calculated by the ECM based off of temp and RPM.

Chrysler went this route to save a few pennies on a switch instead of a REAL transducer (expensive) and simply wrote a few lines of code into the programming (darn near free) to give the appearance of a gauge. #@$%!
That is why oil pressure readings are not available on monitors that plug into the OBDII port (such as the Quadzilla Scout or Edge Insight) on ANY 3rd gen truck!

Fact is that the ACTUAL oil pressure will swing wildly with RPM and temp. The gauge on the dash will ALWAYS read a stable, constant pressure based on what "customer expectations" are.

I had no idea of this chicanery until I stumbled on a thread about a manual fan control switch for the visctronic fan drive on the 3rd gens. The OP found this anomaly completely by accident while tricking the coolant temp sensor to believe the temp is 225* to make the fan full engage... He noticed that the oil pressure reading was lower because the ECM had calculated that the oil would be thinner at the higher temp! He later tested the oil pressure sensor with compressed air and an OHM meter and found that it was just a cheap 6 psi switch... AKA idiot light!!!

Truth be told, 62% dilution would yield barely enough pressure to keep the switch in the "normal" position, which is 4 psi under the 10 psi that Cummins recommends as an absolute minimum!!!

Fuel dilution of ANY amount could cause harm! I know from personal experience that an injector pump seal failure that caused fuel dilution enough to trip the light on my 92 (that has a REAL transducer) will destroy the bearings in a turbo spinning around 60-100k RPM in a matter of about 60 seconds !!!

 

[stuartecker]

i have a 08 2500 cummins and have the same test results with 9000 mis with amsoil. i wonder if this is normal for the emissions on the truck. wondering if going back to regular oil and 3-5000 mis. might reduce the fuel dilution.

 

[KLauber]

i have a 08 2500 cummins and have the same test results with 9000 mis with amsoil. i wonder if this is normal for the emissions on the truck. wondering if going back to regular oil and 3-5000 mis. might reduce the fuel dilution.

STuart if you are driving many miles without stopping you should change it based on oil analysis even using Amsoil. The regen of the DPF will dump extra fuel into the crankcase regardless of which oil you're using. Deletion of the DPF and EGR will end the fuel dilution issue.



Ken

 

[stuartecker]

i've had the same results 3 times after 9000 mis on amsoil.

 

[stuartecker]

how do you delete dpf and egr? what are they? sounds like the nature of the engine's

emission system. am i right. and if so maybe cheaper oil and shorter change intervals might be better.

 

[KLauber]

how do you delete dpf and egr? what are they? sounds like the nature of the engine's
emission system. am i right. and if so maybe cheaper oil and shorter change intervals might be better.

Deleting the DPF and blocking off the the EGR is accomplished with an off the shelf delete pipe and metal plate, but you have to buy a tuner (Smarty, H&S, etc) which has software that resets the ECM software counters and makes the engine think everything is aok. It will end the fuel dilution issue and may give you MPG increase. You will amortize the cost of the tuner over a year or so based on oil and fuel savings is the the theory.

Ken

 

[stuartecker]

where can i buy the delete pipe and metal plate. who can install for me. thx

 

[KLauber]

H&s

where can i buy the delete pipe and metal plate. who can install for me. thx

Everything is at H&S Performance, here's the web page.



350HP Pickup - 2008 - Dodge.



Robert at H&S will answer all your questions via email.



-- email address removed --



PS, this is an afternoon DIY job to install the delete pipes and software.



Ken

 

[KLauber]

Instructions

where can i buy the delete pipe and metal plate. who can install for me. thx

How to guide by Blake in Kaplan, Louisana:



Deleting the 6. 7: A guide to making it run right! - Dodge Diesel - Diesel Truck Resource Forums



Cheers,

Ken