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There are oil tubes that run along the top of the cam bearing towers on each engine head. They get old and clog or shrink and pop out. When this happens, little or no oil gets to the cams/bearings/followers, and this is very bad and has expensive outcomes. The oil tube fittings themselves are maybe $10 and are very easy to replace - but it is CRUCIAL that the fittings, which are barbed are pounded back in with a rubber mallet so that the tubes are entirely seated in the little v-pillows along the towers.
I bought my 85 380SL with a cam oiler tube that literally lifted off of the towers. The cam lobes were scored, and many of the cam followers were flat. Even with my own labor and very careful shopping of aftermarket/eBay parts, this cost almost $400 to repair. All for the lack of $10 of parts and a little preventative maintenance.
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