Fuel grades for gasoline engines
Unleaded gasoline "super", with an octane number according to I.M. of at least 95 / with an octane number according to M.M. of at least 85.
If unleaded "super" gasoline is not available, then unleaded regular gasoline with an octane rating according to I.M. of at least 91 / with an octane rating according to M.M. of at least 82.5 can be used temporarily. In this case, it is necessary to disconnect the matching connector on the engine control unit (under the right headlight), otherwise there is a risk of engine damage.
(Article obtained from this portal: MercedesMan.ru)
The matching connector is located - when viewed from the front - on the left side of the engine control unit. Engine power may decrease and fuel consumption may increase. Full load movements should be avoided. If "super" gasoline is used again, connect the matching connector.
Fuel additives must not be used.
Diesel Fuel Types
Use only standard grades of diesel fuel for vehicles (according to DIN EN 590 standard). It is forbidden to use ship (Marine Diesel Fuel), boiler and similar diesel fuel or methyl polyesters of vegetable oils (PME/RME).
No fuel additives required. If diesel fuel grades with a sulfur content greater than 0.5 percent by weight are used, it is recommended to change the engine oil at shorter intervals.