2006 Monaco Knight rear axle oil

[Hedgehog]

I am doing a pretty comprehensive service on my 2006 Monaco Knight since it is 5 years old. I have done most of the work already but want to either check or change the oil in the rear differential. The fill bolt on the axle only says to use Eaton long interval axle lubricant. The Monaco owners manual only say to use a oil that meets the following spec; MIL-L-2105D. It does not mention weight of oil. Does anyone know what I can use to either top off my rear axle or completely change. Also, what is the oil capacity of the rear axle? Thank you in advanced.

[Mike Canter]

In my 2004 Monaco Signature Monaco state in the manual that they used Pennzoil Synthetic 75W-90 GL5 Gear Oil. I was down a little so I went out to find the Pennzoil sysnthetic but no luck. Nobody on the internet or is auto stores keep it. I called both Pennzoil and Mobil and they both say that there two oils are compatible with each other. So I topped my differential with Mobil 1 Synthetic 75W-90 GL5 gear oil.

You should call Monaco tech line and asked them what they used in yours because if they used non synthetic then the oil doesn't have to be changed for 125,000 miles. If they used synthetic then it is good for 250,000 miles.