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It is mileage and operating hours per the Diesel Supplement Manual- "The oil change reminder will remind the owner to change the engine oil every 15,000 miles (24,000 km) or 500 hours, whichever comes first..." (Page 94)
Be sure to use the Diesel Supplement Manual.
(GASOLINE engines monitor...
I was able to modify the rails so I could remount them. I cut the rail off so it was a little short of the box and mounted it using four T-nuts. First photo shows where I added a loop so the end of the strap was easier to reach. By the way, my truck didn't have the adjustable tie-down hooks...
I have the Roll n' Lock M Series on 2019 3500 with Ramboxes and like it. Better than the fold-up cover that came on a used truck I bought and better than a Gator that replaced the fold-up.
The Roll n' Lock box is smaller and takes up a little less space. I thought the pull strap might be...
I have the Roll-N-Lock M series on my CCSB with Ramboxes and really like it. Big improvement over the Gator that I had on a 2014 CCSB without the Ramboxes. The M series box is definitely smaller than the Gator box. Water has been minimal when it has gotten in.
Here are a couple of links that will show you one manufacturer supplies many brands with their DEF.
The first link is to manufacturers in general. DEF Manufacturers
The second link is a list of brands manufactured by one company. Old World Industries List of Brands
Interesting to see...
I'm trying tongue depressors. Not popsickle sticks but the bigger and stronger tongue depressors. They hold the flap open just enough to pour in the additive.