The early 110's had problems with cam lobe lubrication. A later design reduced the number of cam bearings to increase oil pressure and flow to the lobes. I personally have not heard of problems if the oil was changed at reasonable intervals, and the valves were kept adjusted.

Because the 110's are leakers, I would not change to synthetic. But if you're not using any oil, you might consider a lighter weight like 10/40 to increase flow when the engine is cold.

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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