Very easy to pull the pan, no brainer and worth the effort. Personally I would not spend the money for the RP, Valvoline long life or similar is good enough.

If you want to use synthetic, do a search, I have heard one brand was prefererred over others but cannot recall which it was, redline maybe?

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6