Chevy Silverado and GMC Sierra Forum banner

Supertech DEF

6K views 7 replies 5 participants last post by  monkey  
#1 ·
So I've only had my Duramax for a week now but I've been shopping around for things like DEF so I know exactly where I'm going to get it when the time comes to add more. I was at Walmart and noticed their Super Tech brand DEF is only $7.88 for 2.5 gallons. Which is a good bit cheaper than the name brands. I always try to use name brand stuff when it comes to maintaining my vehicles but is it necessary when it comes to DEF? It states on the jug that it meets requirements for all SCR vehicles and has the API stamp that the Duramax manual states to look for. I'm thinking it will be fine since it's just getting sprayed into the exhaust and meets standards. Has anyone tried it?
 
#6 ·
Go to truck stops and go up to the bulk DEF fueling pumps which are on every diesel fuel island. Top off the DEF. Or check at local commercial truck dealers. The local Mack truck dealership will fill any DEF tank, car, pickup, commercial truck, etc for about $1.86 a gallon last time I checked. Nothing really wrong with the containers one can get at the store, but DEF does have a shelf life. I would not buy any DEF that is over 1 year old. This is why it is usually best to get your DEF at bulk fueling locations where heavy trucks fuel. Those places go thru hundreds of gallons of DEF daily and it is fresher, and cheaper.

It is ok to buy a tote just to have one on hand, but again, shelf life comes into play. Rotate it out within a few months. Wally World's Supertech is probably just fine for quality. It more than likely is just repackaged name brand stuff.
 
#7 ·
judsonlimited said:
Screw DEF, delete it
That is an option. My only desire on a diesel nowadays is to shut off the EGR. I could care less about the downstream stuff like SCR and DPF. But making a diesel eat it's own feces via EGR, not the most brilliant idea anyone came up with. I would tune out the EGR even on a new under warranty ride early on. I did that on a 2006 Jeep Liberty Diesel, and the results were fantastic. 3-4 mpg increase and the oil was less soot laden between oil changes. And no risk of EGR failure, as the EGR wasn't being used. Didn't have to turn a wrench and remove it. Not bad... $400 tune and no wrench turning to get what I want. Not sure the dealer could ever tell a thing. The only part of the ECM tuning that was changed was a code change to not use EGR. Everything else remained the same.