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I've never read about, heard or seen any type of engine mount "wear indicators" as you're implying for any Volvo but I use a prybar to check those front engine mounts on 850s when I suspect it's NG.
When it's NG, the front of the engine noticeably sags and the car often has an unusual exhaust related vibration noticed at idle. From the bottom of the car, I use a prybar and move the engine upwards and if that mount is worn, the movement seems excessive. It's also easy to replace and not overly expensive.
The other two lower liquid filled mounts are more costly, more of a pain to replace but seem to last longer as I have yet to replace one on an 850.
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