Filtering 75W-140 Synthetic Gear Oil?

[BruceM]

I drained the synthetic 75-140 gear oil from the rear of my 00 F-250 into a clean pan and it came out a lot cleaner than I expected. Upon looking at the diff cover i see 2 different colors of RTV on therer so I have to believe this was serviced at some point. No metal shavings, nice normal wear pattern on the gears, and the gear oil had a nice light honey color. The brand new oil I bought has a extra light olive oil color to it.

So I can't see how this stuff is anywhere close to actually needing to be changed, so I figure I'm going to add 1 qt of new, and then top off the diff with the old fluid. Before doing so I figure I should filter it somehow.

Is there any suggested way to filter this stuff. I have it in a clean oil 1 gallon jug in a bath of hot water right now heating up so that I can pour/filter it. I was thinking about coffee filters but that could take all day. Also thought about using a mity-vac to pull it thru either a Magnefine filter or a 40 micron steel mesh screen fuel oil filter.

Any thoughts or suggestions other than dumping it and going with all new? I'm planning a gear ratio change in the fall and possibly a locker, at which point I'd prolly put in all new Amsoil.

Thanks

 

[Johnny]

I would just install the new gear oil and recycle the old. If I were going to try and do what you are talking about, I would first send off a sample for testing. It's hard to tell by looks alone what's in there.

 

[cosynthetics]

For only a few dollars I'd just use all new.

 

[BruceM]

Well at $15 a qt the stuff ain't cheap, and needing 4 bottles is alot. I've spent a bunch on this truck fixing and upgrading things plus the fluids and a sensor. I'm trying to not bleed any more cash.

If the stuff was not synthetic and came out with all sorts of metal or [censored] in it I would believe that it absolutely needs to be changed. Ford says it never needs to be changed and I can tell it has been done before I can't really see the need.

Filtering anything that got knocked into the pan while draining is is my main concern.

 

[dwendt44]

Coffee filter in a funnel is a method I have used for filtering oil or fluids.
Two paper towels or one of the paper shop towels in/over a large funnel works to.

 

[mechtech2]

Coffee filters rock the house, but are slow when you rely on gravity to furnish the push power - especially with thick oil. They will get your oil back in great shape for use , for pennies.