Which brand of def fluid.
Was talking to the commercial truck guy at a ram dealer and he said they recommend using mopar brand def fluid in the cummins hd diesel.true or false.
Forum Discussion
Perrysburg Dodgeboy wrote:IdaD wrote:
Your manual, and I assume this is true for the Powerstroke and Duramax as well, just calls for API certified DEF. Walmart Super Tech is API certified and runs a bit over $8 per 2.5 gallon jug, and I've used it without issues - it's more convenient for me than driving across town to get it at a pump. I don't see a reason to pay more for the name brand stuff - it probably comes from the same factory anyway.
Which is 1.75 to 2.00 higher than at a truck stop. Buying from a truck stop gets you the freshest Deffects and you only buy what you need to fill the tank.
Don
But it also gets you the highest risk of contaminated DEF as well compared to a sealed container.
I've been running the API rated stuff in a container for almost 4 years and 92k miles without a single DEF issue.
