Not all DEF is the same. DEF that's recommended shall have the API Diesel Exhaust Fluid Certification Mark. API stands for American Petroleum Institute. https://www.api.org/products-and-services/diesel-exhaust-fluid/All the same. If you're buying it by the box, check the date code.
Would it be possible to walk into any regular auto parts store in America, and buy DEF that wasn't API certified?Not all DEF is the same. DEF that's recommended shall have the API Diesel Exhaust Fluid Certification Mark. API stands for American Petroleum Institute. https://www.api.org/products-and-services/diesel-exhaust-fluid/
Interesting. I just buy the name brand stuff (PEAK). Next time I go to buy some I'll look at the off brand stuff and see if it has an API cert label on it.
(Painful as it is) I have to agree with WXdude here-I have never seen DEF that wasn't labeled as certified. I'd be willing to bet that the $7 Walmart brand comes off the same line as the $13 PEAK brand. Y'all are overthinking this. It's a urea/water mix. Not a lot to go wrong there.
That's about 4300 miles. That's pretty good. Mine was showing full on the gauge but went down to 35% after 3500 miles. And 90% of my miles were highway miles and each trip averaging 15-20 miles commute to work.I checked the gauge when I was at the dealer taking delivery. It wasn't full, so I had them top it up. Went 7000km showing half full.