Passenger side corner of cyl. head on SOHC M103 motors is indeed are spot where oil is known to leak out of. Get a strong flash light and take a look in this area. Once the leakage from this area picks up, you'll begin to see oil dripping off the cross-member that covers the tranny torque converter. Some believe this is not a situation you want to ignore for too long. I forget if it's a feed or return line(oil) that's in the vicinity of the right rear corner. Either way, once the gasket gives way, you can loose alot of oil in a hurry.
1991 300-SEL - Model 126
M103 - SOHC
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