2003 Mercedes G-Class Owner's Manual - Page 220

Operation Engine compartment Adding engine oil Unscrew cap 2 from the filler neck. Add oil. Be careful not to overfill with oil. Be careful not to spill any oil when adding. Avoid environmental damage caused by oil coming into contact with the ground or water. Transmission fluid level The transmission fluid level does not need to be checked. The transmission has a permanent supply of automatic transmission fluid. If you notice transmission fluid loss or gear shifting malfunctions, have an authorized Mercedes-Benz Light Truck Center check the automatic transmission. Coolant level The engine coolant is a mixture of water and anticorrosion/antifreeze. When checking the coolant level the vehicle must be parked on level ground the engine must be cool. The coolant level should reach the COLD LEVEL mark in the reservoir. Warning! G In order to avoid any possibly serious burns: Use extreme caution when opening the hood if there are any signs of steam or coolant leaking from the cooling system, or if the coolant temperature display indicates that the coolant is overheated. Do not remove pressure cap on coolant reservoir if engine temperature is above 194°F (90°C). Allow engine to cool down before removing cap. The coolant reservoir contains hot fluid and is under pressure. Using a rag, slowly open the cap approximately 1⁄2 turn to relieve excess pressure. If opened immediately, scalding hot fluid and steam will be blown out under pressure. Do not spill antifreeze on hot engine parts. Antifreeze contains ethylene glycol which may burn if it comes into contact with hot engine parts. ! Excessive oil must be siphoned or drained off. It could cause damage to the engine and catalytic converter not covered by the Mercedes-Benz Limited Warranty. The oil dipstick 1 tube allows for draining of oil by using a suction device. Screw cap 2 back on the filler neck. 220