RE: Transmission Fluid Type for 560SL
The motor oil you use will be somewhat dependent on external temperature. For example, in sunny, warm FL, where I am, I use Castrol or Kendall 20W50. If I still lived in NYC in the winter I changed grades to 10W40. Whatever you choose, in my opinion, never use any synthetic oil in your engine. The synthetics high detergent content will act almost like a flush in your engine and get it too clean and your seals will almost assuredly begin leaking. MB recommends synthetics for it's newer engines as they were designed for it. The 117 engine we have was not.
'99 SL500-For Now