About one year ago, I purchased both engine mounts from eEuroparts.com. I replaced them both and eventually noticed that the passenger side (below the oil filter) mount was collapsing, i.e., sort of way stretched out and sinking. Yesterday, I replaced this mount with one that I purchased from voluparts.com. It was brand MTB and came in a blue box.

The old mount wasn't separated and, to be honest, I really couldn't tell any difference between the new MTB and the old one.

To replace, I loosened both engine mount bolts (drivers and passengers side), removed the oil filter, and used a small jack and block of wood to lift up the passenger side of the oil pan. I carefully watched to verify the drivers side mount wasn't getting stretched or pulled. The only problem I had was getting a wrench between the steering rack and the sway bar on the front bolt. The whole job took me about two hours.

The new engine mount doesn't sag. The old one did. I suppose there are different grades of rubber??? I dunno.
Cabbie2169

http://www.brickboard.com/RWD/index.htm?id=951062

Attached post shows failed passenger motor mount with *NO* oil changes in between (kid away at college)
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Jim (90 244DL 175K miles) turbo sways w/poly, front struts & bushings, OD wiring, downpipe, OEM hitch, remote-locks.

My passenger side engine mount was just as you described, sagged and all out of shape but still in one piece and holding the engine. I think what happens is when the oil filter is changed the spilled oil from the filter leaks onto the engine mount and degrades the rubber making it spongy. I now cover the mount with rags, stuffing them between the bottom of the filter and top of the mount, to catch any oil that drips out during the filter change. It's a pain getting the rags around the mount when then engine is hot but the effort seems worth it as my mount still looks like new after 5 years.

Hope this helps.

Oil changes take a toll on that mount because of the oil that drips down when the filter is removed.

Oil will kill that rubber.

I usually put a few layers of paper towels between the mount and the filter before I take the filter off during an oil change.
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Proud owner of "The World's Most Famous Volvo Radio!"