No, I have never looked that closely. (only had it a couple months)
I will get underneath this weekend *now that the weather is nice!* and with the help of rs90kirk and diesel don will try to post more information on this subject.
Current: '91 300TE 4MATIC 317k and climbing...
'81 300TD Wagon 168K "Tank"
'83 240D 216K 4spd manual "Da Bear" (aka best car ever)
"Never sweat the petty things...
and never pet the sweaty things."