On a 85 300d.Is it the one right in the middle of the car underneath the front of the car? I'm pretty sure it is...

I suggest you find a Haynes manual at the very least before you start wrenching on your car.... A little general research will make life much safer...

Its the one on the motor. The motor is in front, the transmition is behind the motor.

A manual is your best tool, though it sure is nice to get reassurances here, I know.

I will take a pic in the morn if you need it.

Just be sure, when you pull that plug, to catch the copper washer, you need it!
And don't over tighten that plug..

Does anyone have the link for that online manual?
Are we now blocked from that skinnerbox manual?

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Think Alternative Energy!
300CD '80 (now gone but not forgotten...)

heres a look:
http://www.dieselbenz.info/maint_oil_change.htm

__________________
Think Alternative Energy!
300CD '80 (now gone but not forgotten...)

Throw away that copper washer !!!!!
You should be changing the filter at the same time you change the oil...and a NEW copper washer should be included in that... it is typically a one time use.. it is in the category of a crush washer...thus copper... so it is a one use washer to work right...