Date registered: Oct 2012
Vehicle: 1968 250S, 1991 300se, 1998 SL500, 2x 1977 450SEL 6.9. Past MB's; 300SD, 300E, 300TE, 190E, ML420
Mentioned: 5 Post(s)
Quoted: 405 Post(s)
Could be a lot of locations. Clean engine thoroughly and then run for a while and see where it comes from.
Could be anything from front crank seal to fittings on oil filter, gasket on fuel pump, oil pan drain plug washer, etc.
I'm solving a leak on my 250S right now, and I found a pinhole in the block casting behind the water pump. Extremely unusual. Didn't start leaking for over 20 years there. Useda little JB weld to seal.
You just have to play detective and hunt it down.