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Old 09-20-2021, 03:03 PM   #29
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DEF crystallization. FWIW


https://static.nhtsa.gov/odi/tsbs/20...17726-9999.pdf
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Old 09-21-2021, 12:18 AM   #30
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I beg to differ as I find no substance in that statement.
Entirely correct. DIesel has jumped the shark...at this point, gas power is a better plan.
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Old 09-21-2021, 05:54 AM   #31
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On my second diesel truck. First was a Chevy Dmax, and the one and only DEF problem was a known issue with the tank heater. Had the heater go out, and dealer replaced under warranty. Have a '19 RAM now, and no problems in 27K miles so far. Both trucks have done a lot of short city drives, without problems. When on the road, since I usually use truck stops for ease, I purchase DEF at the pumps. Can't get any fresher.
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Old 09-21-2021, 07:32 AM   #32
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I hope they get these technical problems with DEF systems worked out. Actually I think most of the problems are with older systems. You don't hear too many complaints about new vehicles.



DEF is very effective at eliminating NOx. Most NOx is currently eliminated through exhaust gas re-circulation. The EGR system works but it lowers engine efficiency, causes engine wear and creates soot and the need for a diesel particulate filter. There is now talk of using more DEF and less EGR. Perhaps EGR can one day be eliminated altogether. It would probably require doubling the amount of DEF needed, but I think we'd be better off with that.
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Old 09-21-2021, 07:44 AM   #33
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I agree, and would be happy to double my def to get rid of the egr system.
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Old 09-21-2021, 07:50 AM   #34
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DEF crystallization is most commonly caused in big rigs by topping off with hard water. Water evaporates from DEF over time and leaves behind UREA deposits. I've never had a crystallization issue in my DEF tank.

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Entirely correct. DIesel has jumped the shark...at this point, gas power is a better plan.
Better is subjective I think. I don't see any gas engine being able to tow my 15k 5ver as efficiently as my diesel engine. While they're not for everyone and not everyone needs a diesel, they have their place. You'll never get a gas engine to produce the same amount of torque at the same low rpm nor will you be able to achieve the same fuel mileage when towing.

If someone is going to use the truck primarily for towing a heavy load, a diesel is the way to go.
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Old 09-21-2021, 08:07 AM   #35
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You'll never get a gas engine to produce the same amount of torque at the same low rpm nor will you be able to achieve the same fuel mileage when towing.
I think you nailed it. I've had only diesels for some time now and I've gotten so used to all that low-end torque that I can't stand driving a gasoline powered vehicle anymore.
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Old 09-21-2021, 08:08 AM   #36
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I've had a few mention if you are doing a lot of unloaded city driving to NOT fill the DEF tank full. Fill only 1/4 to 1/3 so you use it up sooner... and forces you to keep putting small amounts of fresh DEF in the tank.

That way the risk of the DEF getting old is minimized.
DEF isn't as unstable as some would have you believe. I've seen estimated shelf life over at least a year if properly stored.

To be completely contrary to this post, I keep my tank full. Now in our case that's easy. Once the DEF level guage drops the first quarter I know it will take a full 2.5 gallon container.

DEF will dry/crystalize, very difficult to do if the tank is full. Put a few drops on the driveway and watch it turn to a white powder.

If you're not using at least one tank of DEF in a year you probably don't need a diesel.
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Old 09-21-2021, 09:33 AM   #37
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I think you nailed it. I've had only diesels for some time now and I've gotten so used to all that low-end torque that I can't stand driving a gasoline powered vehicle anymore.
^This is me!

Drives me nuts to see the tach indicating 4,000+ rpm in an engine - which is what any of my gas engines do when pulling a load up a steep grade.
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Old 09-21-2021, 09:38 AM   #38
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I get antsy now when I go over 1500 RPM but when I was younger 7000 RPM was cool.
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Old 09-22-2021, 10:23 AM   #39
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^This is me!

Drives me nuts to see the tach indicating 4,000+ rpm in an engine - which is what any of my gas engines do when pulling a load up a steep grade.
You would probably have a stroke if you ever rode a motorcycle and saw the engine was spinning 6000RPM on the highway. Why do you have a problem with an engine running at the RPM it is designed to run at?
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Old 09-22-2021, 11:52 AM   #40
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The new gas engines, especially the V8 run smooth at higher RPMs. And the newest trucks have 8, 9, 10 speed transmissions. That keeps the engine in a 'Happy' RPM range.

I would agree if the gas engines were buzzy and vibrated a lot. But now none of that vibration makes it into the cab.
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Old 09-22-2021, 01:15 PM   #41
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The only downside that I see to a gas engine is the lack of an exhaust brake if you're going to be towing heavy. The *only* reason I'd consider a diesel is if we were to upsize from our TT to a big 5'er.
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Old 09-22-2021, 01:26 PM   #42
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You would probably have a stroke if you ever rode a motorcycle and saw the engine was spinning 6000RPM on the highway. Why do you have a problem with an engine running at the RPM it is designed to run at?
It's not the rpms that so bothersome although it gets old in rolling hills or the mtns in the PNW. It's the lack of power, especially at 5,000' plus.
That and the hassle of poor mpg's.
We all take risks in life. Some see diesels as risks. I see it as a bonus. I rode MC's for 12 years straight. Many saw it as a risk. I did too. But the fun factor over rode the injury factor for me.
Yeah some of my MC's ran high rpms, but it was pleasure IMO. Not the same as towing for me. JUst because gas trucks are meant to rev when towing up hils doesn't mean I have to accept it.
I'll take my chances with a diesel as well.
After owning both over the years I just prefer a diesel period.
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