GEAR LUBE LEVEL QUESTION, 2016 CTD 2500

jdc1 wrote:
Fill until full. Can't screw it up.

This! Don't make a mountain out of a mole hill.

Fisherman wrote:
Go to the proper fill level, over filling can cause oil to seep past the seals and ruin rear brakes. Rule of finger was fill until you can just touch the oil with your finger bent down in the hole.

Yes, but see my original comment. The specification is plus or minus 1/4" inch from the fill line on the diff cover. You can fill 1/4" below the line or 1/4" above the line as I understand it.

The bottom of the fill hole is exactly 1/4" above the fill line. So it would seem to me if you filled to the bottom of the hole, you would be within spec.

One guy on Youtube made an L-shaped tool whith a 1/4" bend in it to hook into the hole and get exactly to the fill line. Not sure if that's necessary.

Cummins12V98 wrote:
AMZ/OIL 75-90 Severe Gear 4 quarts. Use their soft fill container and its full when it pours out!!!

You will thank me, the OE lube is JUNK!

That's exactly what I'm using based on your advice a few months ago. Finally getting around to doing it.

AMZ/OIL 75-90 Severe Gear 4 quarts. Use their soft fill container and its full when it pours out!!!

You will thank me, the OE lube is JUNK!

Go to the proper fill level, over filling can cause oil to seep past the seals and ruin rear brakes. Rule of finger was fill until you can just touch the oil with your finger bent down in the hole.

Fill until full. Can't screw it up.

Yes.