looky here

[dieselredneckva]

All of mine with the exception of my personal trucks are used for fleet for my business thats why i change them often. Still not up to the recomended mileage i just like to to be safe. I got stranded one time. Not again lol.

 

[no-red 6 0]

better safe than sorry

 

[big_rooster]

i change mine every other oil change but that's just me and why is that damned brass plug aimed at the driveshaft. Pull the plug and a nice stream hits the drive shaft. Now i use a tranny funnel in a coke bottle to see what comes out, plus the tranny funnel has a taller back to catch heavy streams. Don't let the plug fall into the funnel though or you'll make a really good mess.