My specific Mercedes Factory Manuals for my 126 do not have group 40. That's why I asked the question. My 123 manual does however have that information, but I know the specs are different for the 126.

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)