The fluid I added came a Mercedes specialist. It came in a blue plastic container and had the Bilstein name on it. The new fluid was clear, what is in the tank is nearly black.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro