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Old 05-17-2016, 12:46 AM   #15
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Ours has the DPF and I think the oil would cause it to regen more often.
Yes it would, we should not add lubricant to an engines fuel if you have a DEF system.

As mentioned by our Diesel Tech above, the DEF system is the last stop for the exhaust cleanup process, and it works, So adding more oil will cause it to work harder/more often.

The addition of 2cycle oil to the older fuel systems will increase longevity of the fuel pumps with out a doubt. The older pump systems rely on the fuel for lubrication more than the newer non-pump or electronic fuel systems.

My terminology (non-pump) may be misleading to most but I'm conveying this in my own words, and experience, not from a manual for now.


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Old 05-17-2016, 07:55 AM   #16
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Interesting discussion.

I purchased a 2001 Dutch Star with a Cummins ISC 8.3L. I was not aware of the need to add 2 cycle oil to my tank. I have only had the coach for 3,000 miles or so.

Sidebar question, how much do I need to add? Is it X amt per so many gallons of diesel??
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Old 05-17-2016, 08:38 AM   #17
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Interesting discussion.



I purchased a 2001 Dutch Star with a Cummins ISC 8.3L. I was not aware of the need to add 2 cycle oil to my tank. I have only had the coach for 3,000 miles or so.



Sidebar question, how much do I need to add? Is it X amt per so many gallons of diesel??

Many like the products by Opti-lube for this purpose.

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Old 05-17-2016, 08:43 AM   #18
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DEF is NOT a big deal buying or adding it to my lowered emissions diesel. (400 DEF mpg) You breath better because my engine runs cleaner. The newest diesels get better MPG too. (9 mpg on 35k lbs.) Black smoke on diesels should have been stopped 40 years ago when cars had to reduce emissions.
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Old 05-17-2016, 09:02 AM   #19
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I have also heard that ULSD and bio fuels may have an impact on older engines with regard to fuel leaks due to deteriorating gaskets. Newer gasket materials have over come this alleged problem......true or false?
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Old 05-17-2016, 09:11 AM   #20
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Couple quarts of ATF work....
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Old 05-17-2016, 09:13 AM   #21
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DEF is NOT a big deal buying or adding it to my lowered emissions diesel. (400 DEF mpg) You breath better because my engine runs cleaner. The newest diesels get better MPG too. (9 mpg on 35k lbs.) Black smoke on diesels should have been stopped 40 years ago when cars had to reduce emissions.
Really, have you ever been behind a Vehicle that is doing it's REGEN breathe that air
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Old 05-17-2016, 09:15 AM   #22
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Take a look at the air pollution in China! They need to work on that.
No worries, California is going to clean the worlds air all by it self!
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Old 05-17-2016, 08:26 PM   #23
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Quote:
Originally Posted by Fiesta48 View Post
DEF is NOT a big deal buying or adding it to my lowered emissions diesel. (400 DEF mpg) You breath better because my engine runs cleaner. The newest diesels get better MPG too. (9 mpg on 35k lbs.) Black smoke on diesels should have been stopped 40 years ago when cars had to reduce emissions.

I have the Maxxforce 10 with 1250 ft lbs. in a 40K lb. coach. The MF10 passed the 2010 EPA standard but the MF13 and 15 did not. I do not use DEF, 300-500 lbs less weight and less complexity to possibly breakdown. At 20K miles I'm getting about 9.5 MPG and have gotten 10.4 on a trip from the Florida Keys. Great engine that likes to be driven hard.
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Old 05-17-2016, 09:00 PM   #24
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My 2007 Itasca is on a 2006 chassis and has neither DEF or DPF and I like it that way. 7-8 mpg moving 35K + toad.
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Old 05-18-2016, 09:30 AM   #25
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My only gripe with DEF is the added complexity to an already complex piece of equipment. I have no problem with finding or adding DEF (and I seem to use lots of it).

I do like the cleaner exhaust. I do like the ability to rely less on the EGR to meet standards. I have heard of plenty of people with expensive, complex EGR-related problems, and the idea of re-rintroducing waste gas into the intake seems counterintuitive. I think that post-DEF engines can make more power and still meet EPA regulations compared to their pre-DEF twins which rely on EGR and DPF.
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Old 05-18-2016, 11:16 AM   #26
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Diesel engines that utilize reductant (DEF) still use EGR to cool the combustion chamber, just as much as non DEF engines do. Also, the SCR (selective catalyst where the DEF is consumed) has the sole responsibility of reducing NOX in the exhaust, the DPF (diesel particulate filter) removes the physical soot. They are both used and perform different functions. A "regen" raises the temperature of the DPF to between 1050f and 1250f during highway operation and incinerates the built up soot from the DPF when the ECM has determined that it is full.

The early usage of EGR on diesel engines resulted in oily buildup in the EGR passages and in the EGR cooler, and at infrequent intervals made it necessary to clean and/or replace certain parts to keep the system in good working order. The latest EGR systems will cycle the valve open and closed a few times when the engine is shut off to prevent clogging, and the newest software in the ECM helps to eliminate cooler clogging by restricting EGR operation to only those RPMs that provide good flow.

With no intention of offending anyone here, , a good majority of my diesel customers have been mis-educated about their machines from the internet. There have been instances where they have demanded the "whole system" be replaced when in fact it may simply need a temp or NOX sensor. It's all good though.

Happy trails, Drive safe.
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Old 05-18-2016, 08:18 PM   #27
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Different additives tested for lubricity
Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums

I use Walmart low ash 2 cycle because it works, is readily available and is cheap

FYI if you have a more modern engine (anything with emissions for sure) no lubricity additive is necessary - my injector pump is 20 yrs old

I use PRI-D for microbial control from offshore experience..it works.
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Old 05-18-2016, 08:24 PM   #28
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Quote:
Originally Posted by cbramsey View Post
Interesting discussion.

I purchased a 2001 Dutch Star with a Cummins ISC 8.3L. I was not aware of the need to add 2 cycle oil to my tank. I have only had the coach for 3,000 miles or so.

Sidebar question, how much do I need to add? Is it X amt per so many gallons of diesel??
I didn't use/need it in our 2000 or 2002 Dutch Stars. Just used the ULSD with no problems even with the Banks kit on the '02 ISC 350.
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