Mercedes-Benz 600 SEL 1993 Owner's Manual page 146

Check Regularly and Before a Long Trip
144
1 Fuel Supply
To add fuel turn cap to the left
and hold on to it until possible
pressure in tank has been
released, then remove cap.
2 Tire Inflation Pressure
Check at least every two weeks.
For details see Index.
3 Coolant Level
See Adding coolant in Index.
4 Windshield Washer System,
Headlamp Cleaning System
For refilling reservoir see Index.
5 Engine Oil Level
See Index.
6 Brake Fluid
See Index.
Vehicle Lighting: Check function
and cleanliness. For replacement
of light bulbs, see Index.