If the engine has to come out...
and it sounds like it does since it will take them time (rear seal would be somewhere between the engine and trans -- so they would have to be separated-- am I correct?
please correct me if im wrong)
Id look into having several items replaced while the engine is out... especially nearing 100,000.
There are several items that require/would need replacement soon due to age/mileage
I would seriously think about paying for some of these items out of pocket....
theyre going to need replacement soon anyway-- and I dont see why you would want to pay for labor to get back into the engine bay considering that the engine will be out and all the parts easily accesible.
You can probably talk to the service advisor and ask-- if engine is out-- Ill buy these parts from your dealer- can you install them while the engine is out? at a reduced labor rate (that is not the full price youd pay for this repair alone).
if you can get it done- youll be set for many more miles....
FRONT struts. (you can do the rear shocks yourself)