I've seen some with over 160 and 200 K on the odometer. There's no reason these engines can't go 2 to 300 K miles or more if you maintain them. It's all the other "stuff" on or around the engine you'll have to replace, just like any car. My 2000 Bonneville has 165K miles on it and it still runs great. I'd say most engines should do 200K plus no problem if you change the oil regularly. My friends 86 325 BMW is up over 330K miles now. He just change the clutch this year. Yes, that's right, over 320K on the original clutch. Engine is fine, he's now having to begin replacing a bunch more items though just to keep it on the road.

BTW - My 2004 Crossfire only has 33K on it right now.