I feel for you. I re-read your posts, but could not determine if you replaced the LH oiler tube fittings? If not, then the meltdown must be the result of age, although the few 116 and the 1 117 engine I've dealt with all had old and brittle fittings. Hard to imagine them melting.
On the other hand, if the LH fittings were new, done when you repaired the RH side, then I'd ask where they came from? I installed, this past winter, an aftermarket set of these on both sides of my SL 117 engine, but the car has yet to see the road this season. Now I'm worried that they might melt down like yours!
It really SUCKS that Mercedes would put such a weak link in an otherwise bullitproof engine, including those nylon chain guides, which are the equivalent to me of the modern day engine timing belt. Really, how much more engineering would've gone into tapping those stupid barbed holes in the cam towers and using threaded fittings for the oil rail?

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1986 560SL
2002 Toyota Camry
1993 Lexus