The difference? The w116's m117 had a different oil filter housing setup. Hence the different engine number. Otherwise, all w116's with the EARLY m117 (D-Jet, 52/52-series cams) should follow requirements for the w108/109.

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2021 Charger Scat Pack Widebody "Sinabee"
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1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k