mellonc

How much DEF do you go through every 10k miles? I understand the tank capacity is something like 6 gallons. Do you feel you go through all of it? Mine is only about 3 gallons every 10k miles, which is my oil change interval.

mellonc

Bump. Anyone want to share his/her DEF usage? Or is that too private? it's not like I'm asking how many Depends you through in a month......

gkgeiger

I wish I could be more specific, but mine with 60k has used very little. I drive about 10k a year, and the last time I filled the tank it over flowed with a 2 1/2 gal container. In other words that’s about what it takes a year.

xbzus

I have the same car. It is about 3000 miles per gallon, so your consumption is correct. Also it is a 6.47 gal tank

mellonc

I have more data points to share. In my mixed driving between highway and local roads, it eats up about 1 gallon per 2500 miles. I hope this helps somebody.

John CC

I realize this is an older thread, but I found it while trying to figure out if my DEF consumption was reasonable. (I guess It is...) My plan was to run it down until the warning appeared, then add 2-1/2 gallons and wait for the warning to reoccur. I've had the car now for a little more than 11,000 miles and I'm still waiting for the first warning... Since the car was on a dealer's lot before I got it, I'm assuming it was filled then.

kajtek1

My record shows 1 gallon of DEF per 65 gallons of fuel. This is short-period record, so can't say how accurate. Suppose after AEM bluetecs use more DEF than before, but I have no records to compare.
I drive my Sprinter with Scangauge all the time. The DEF warning light comes at 30% of tank, what should be good for another 2-3000 miles.
IMHO MB screw the DEF tank design on sedans, where they made big tank, to last between service, but deleted spare wheel.
Now I have to carry spare in the trunk, when refilling DEF is easy at almost each gas station, Walmart, Costco and more.

John CC

Well, I should be getting the warning any day now. I've used about 380 gallons of fuel which works out to about 5.8 gallons of DEF, and 70% of my 7.3 gallon tank is about 5.1 gallons.

kajtek1

Understand that 30% happen on Sprinter, who has reservoir lasting for 5-7000 miles. Easy to refill by station distributor since it is under the hood.
Sedans do have reservoir design to last for at least 13,000 miles between FSS calling for service, so logically the % should be different.
Than seeing what programmers did on some MB features, I could never figure out what they smoke, meaning the logics don't apply here.
I don't drive my sedan often, so might take me over 2 years to gain that experience.

John CC

OK! I'll let you know how it finally pans out. I can get a reading on the level with the Autel, if I spend the time figuring out how...