2004 Mercedes CLK-Class Owner's Manual - Page 286

Operation Engine compartment ! Excess 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. Screw filler cap 1 back on filler neck. More information on engine oil can be found in the "Technical data" section ( page 388) and ( page 390). Transmission fluid level The transmission fluid level does not need to be checked. If you notice transmission fluid loss or gear shifting malfunctions, have an authorized Mercedes-Benz Center check the automatic transmission. Coolant The engine coolant is a mixture of water and anticorrosion/antifreeze. To check the coolant level, the vehicle must be parked on level ground and the engine must be cool. The coolant expansion tank is located on the passenger side of the engine compartment. 286