Watch petroleum based products and rubber, they can accelerate the degeneration of rubber. Use silicone spray and pastes for the sticking door jams.
Keep silicone products away from intake areas due to the silicone creating problems with O2 sensors.
Don't forget to lube door, trunk and ignition locks. I have been using a spray graphite and it works very well with the old ignition lock.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)