Should I re-use my lube?

[techie]

A couple of weeks ago I opened up my front diff. to diagnose a problem. Problem is I need new spider gears. So I put everything back together and put new lube in it. I now have the parts and will be replacing them within the next week or so.

Question is, should I reuse the lube I have in there already since it's only been in for 2 weeks or should I just put in new stuff again? I've been using Rotella 70W-90 from Walmart.

 

[huffmuds9320]

In my opinon I would reuse the gear oil. Since you are replacing some new parts so there might be some wear metals from the new parts. I would change the gear oil later like at your next oil change. Just my opinon.

 

[1040 WreckerMan]

If you need new spider gears, there is probably an abundance of wear particles floating around in that diff. Even with new fluid I would change it. If you really want to cheap out you could run that fluid. What kind of a vehicle is it? If the diff gears DO NOT turn while not in 4x4 (we are talking about a 4x4 right? Or is it FWD?) then you have less contamination in the fluid, but is it really worth the 15-50 dollars in oil to change ruining a bearing in the freshened up diff?

 

[JHZR2]

how much does a feq quarts of lube cost????

Probaly not worth it.

JMH

 

[techie]

It is a 98 Grand Cherokee. The gears always turn no matter what.

 

[unDummy]

Never reuse oil unless you have some means of filtering it. New gear oil is cheaper than a remotely pumped recirculating bypass filter.

 

[Nebraskan]

Reusing the oil is kind of like re eating food. I'll pass thank you

 

[SteveU]

The only way I reuse lubes like that is to put it in a oil can for soaking rusty nuts ect.

 

[another Todd]

Dump it. Consider it a good flush.

 

[gtx510]

Wouldn't it be a good idea to use new oil and then change it again after a few thousand miles?