1991 W124 engine trouble spots

[VW1300]

Hello:

I have an '85 300D, but am seriously considering a '91 TE. I want that wagon bodystyle, and this one has good A/C, and my 300D does not. I hate to give up the diesel though, and I really do love my 300D.

Anyway - this wagon has 177k miles on it. Well maintained by an independent mechanic with a good reputation. Question - how durable are these gas engines? I figure I should get the compression tested to see how the rings/valves are sealing which should give me some info. What range am I looking for?

Are there any other specific trouble spots I need to check? I know the front end may need some work as the car ages, so I'll see how tight it feels. I also know about the self leveling suspension - this one works.

Thanks,