2005 Mercedes G-Class Owner's Manual - Page 246

Operation Engine compartment Use the tab to pull cap 1 upwards. Check washer solvent level and add washer solvent as required. Press cap 1 on the filler neck until is has completely engaged. Add MB Windshield Washer Concentrate "S" to the water during all seasons. At temperatures above freezing point, use MB Windshield Washer Concentrate "S" to prevent smearing. If there is a danger of frost, use MB Windshield Washer Concentrate "S" and commercially available premixed windshield washer solvent/antifreeze to prevent water from freezing on the windshield and the reservoir from being damaged. Premix the windshield washer fluid in a suitable container, adapting the mixing ratio to the outside temperature ( page 380). Warning! G Washer solvent/antifreeze is highly flammable. Do not spill washer solvent/antifreeze on hot engine parts, because it may ignite and burn. You could be seriously burned. ! Only use washer fluid which is suitable for plastic lenses. Improper washer fluid can damage the plastic lenses of the headlamps. 246