[RICHAB001]

I don’t want to change it because I don’t want to pay.

You own a 2024, but won't pay for a critical service? Brillant!

 

[RICHAB001]

Friendly reminder here:

If DIY rear diff, be sure to loosen the TOP fill plug before you loosen the BOTTOM drain plug. Old fluid is eminently more preferable to having no fluid at all.

The fluid will not drain from the top plug. Duh. 🙃

 

[RICHAB001]

What are you going to do if, after draining out all the old fluid via the bottom plug, you find out that the top plug won't budge & you can't fill your rear differential with fluid?

Again, crack open the top plug before removing the bottom plug. If you can't open the top plug, don't open the bottom plug. Old fluid sure beats not having any fluid at all.

If nothing else, having the top plug cracked open will help drain out the old fluid.

Again, the fluid will just sit there. It won't drain from the top plug. DUH.

 

[RICHAB001]

But you must be able to take it out to put in new fluid.

Exactly. You can still fill it from the bottom plug. People are always trying to do things the hard way.