DEF Tester
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Laughing Gas
Joined: Aug 2017
Posts: 996
Likes: 132
From: Oklahoma
DEF Tester
I didn't know there was such a thing until I read about it on an rv forum. I always use the jug type as that is the most convenient for me but have been concerned about getting a bad jug, especially after reading about folks emptying the Wal-Mart branded jug, refilling it with water and returning it for a refund. I think Wal-Mart did something to stop that, maybe not, but I now only buy the stuff in a box which would make it obvious if it had been opened. I think the tester may be a good idea but I'm not sure which one to buy. Amazon has a bunch for all kinds of prices. Any recommendations?
Lead Driver
Joined: Nov 2005
Posts: 8,477
Likes: 4,971
You know, I've never in 8 years, gotten any bad DEF, never worried about testing.
The testers are refractometers, very basic test equipment, buy one from a name brand if you really just have to have one.
As to buying jugs, from walmart or wherever, they all come with a seal, so before buying just take the cap off and make sure the seal is still intact, then it's no issue.
The testers are refractometers, very basic test equipment, buy one from a name brand if you really just have to have one.
As to buying jugs, from walmart or wherever, they all come with a seal, so before buying just take the cap off and make sure the seal is still intact, then it's no issue.
Cargo Master
Joined: Oct 2011
Posts: 2,885
Likes: 778
From: SoCal/Wyoming
I also have one. I purchased mine of Amazon for around 80 dollars or so. (OTC 5025 Diesel Exhaust Fluid (DEF) Refractor). I don't use a lot of DEF compared to others so I wanted to test it every now and again to see how it's holding up. The summer temps here are in the 100s but I have not noticed an excessive concentration from evaporation...yet.
Senior User
Joined: Feb 2019
Posts: 142
Likes: 0
Let's say the DEF is 95% of it's shelf life. You test it and all looks good and fill up and it goes bad mid tank and it's see dealer. Just get fresh DEF. That's checking the box code or going to a truck stop, which has been my go to.
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