so my first fill of DEF is coming up. Are you guys paying the 30$/2.5 gal motorcraft wants????

is all DEF created equal??? Walmart has def $8.99/2.5 gal. Peak blue def sells for $10/2.5 gal. Valvoline for 12$

They are all 32.5% Urea.....

 

DEF is DEF as long as it is major brand and relatively fresh. It does degrade over time. I've bought a lot of DEF at Wally World over the years.

 

Just topped mine off with super tech def .. its all the same stuff

 

Red how many miles do you have on your truck? I'm at 1,800 and my DEF still reads full.

 

im at 3200 and have 1/4 left......

 

I use the nozzles at my local gas station. 2.15ish a gallon? something like that.

 

Truck stop is usually a little over 2 bucks a gallon...

 

I used 3/4 of def over 8k miles

 

8k miles?????? Should I be concerned I'm only at 3200?

 

Towing heavy, I was due for DEF right before 5k miles. I am skeptical that my dealer did not fill it entirely.

 

They say def usage is dictated by fuel mileage, so the more you tow the more you'll use .. i haven't towed anything heavy yet

 

Use the high performance def I picked up like 15lb ft on it

 

I was expecting it would improve my audio quality

 

DEF usage is dependent upon exhaust temps. Nitrous Oxide (?) is caustic and produced at high temps like when you're towing. The DEF woks as a catalyst to convert the NO into inert gasses. If you tow a lot, you use more DEF.

 

I typically have the dealer refill it at oil change time. In a few hundred more miles, I'll be at 5k and will have the oil changed. Right now, DEF is less than 1/4 and I'm expecting the warnings to start soon.