I would check out:

O-ring on timing chain tensioner cover? Believe you need a 19mm hex key to unscrew it.

Head gasket? But have never heard of a M110 leaking here.

Cam box - head gasket?

Cam box top cover gasket?

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe