My 92 190E 2.6 rear engine seal is leaking and needing replacement. I took it to an independent shop for evalution and they quoted me a 10 hr labor job (10x$70) or $700. Seals and harware about $35. First of all, does this sound about right as far labor charges? Also, should I get the valve stem seal replace at this time if this saves labor time? I enjoy driving this car; it's a Sportline model and would like to keep it for another 100k. Thanks!

-Larry

-98 C280 Sport 39k
-92 190E Sportline 120k