Newer diesel with least problems

I would buy a dodge 5.9 without a particulate filter, you can find many with low miles 40k to 60k

I'd bet that engines have no idea when the DEF is bad or ineffective. I wouldn't say it but emissions for a diesel have always been less than ideal.

It seems that shelf life at 100 degrees is very short...only a couple of months.

JimK-NY wrote:
I have a basement that stays cool and I will store a jug of DEF there. If your garage is 100 degrees you should buy your DEF as you need it.

The vehicle stays hot in Phoenix - day after day with only a slight cooling at night.
Thousands of vehicles and it doesn't seem to be a problem for them.
And that includes stations where DEF is sold and stored at outdoor kiosks.
I wouldn't worry about temperature too much.

jimh425 wrote:


Don't breath air from your DEF truck either. It's not straight oxygen coming out that pipe.

Well... I met opinions on the net, that breathing the exhaust from modern diesel tailpipe is safer than breathing air directly from Los Angeles streets.
Never could find scientific comparison :)

JimK-NY wrote:
I cannot recall seeing any gas stations with DEF fueling. Maybe I just did not notice since my previous Dodge Cummins did not need DEF. I understand a tank of DEF should last about 8000 miles. I plan to top off the tank before setting out on a major trip. I was even thinking of carrying a gallon or so in case I get low in the middle of nowhere.

This is where YMMV, really applies. My Chevy unloaded, flat road, city/highway driving will go around 5,000 miles before the DEF low verbiage shows. Loaded up with our Camper, towing our Jeep up hills, I’ve seen the refill warning come on as soon as 1,500 miles. I carry a 2.5 gal box just in case we’re out in the boonies when it’s time to replenish.

Kayteg1 wrote:
For those who oppose DEF, you still have HVAC filters in your house and use dust mask when working in dust?
Diesel particles are less common than dust, but then more poisonous.
So when you work on your DEF/DPF-less truck, don't let it idle.
... unless you have death wish.

No air filters with water boiler, fireplace, and no AC.

Don't breath air from your DEF truck either. It's not straight oxygen coming out that pipe.

I have a basement that stays cool and I will store a jug of DEF there. If your garage is 100 degrees you should buy your DEF as you need it.

JimK-NY wrote:
DEF is stable 2 or 3 years at room temp. If you are worried about maximum stability you need to avoid having a full tank during summer months. A few months at high summer temperatures causes more degradation than years of typical storage.

You keep DEF in your room?
My garage temperature stays in 95-105F unless I let the air flow from swamp coolers to exhaust via open doors.
For those who oppose DEF, you still have HVAC filters in your house and use dust mask when working in dust?
Diesel particles are less common than dust, but then more poisonous.
So when you work on your DEF/DPF-less truck, don't let it idle.
... unless you have death wish.

JimK-NY wrote:
DEF is stable 2 or 3 years at room temp. If you are worried about maximum stability you need to avoid having a full tank during summer months. A few months at high summer temperatures causes more degradation than years of typical storage.

Glad I don't have a DEF model.