LHM, “Liquide Hydraulique Mineral”, is a hydraulic fluid with special system for hydraulic circuits, shock absorbers, braking and power steering functions in Citroen vehicles.
Liquids approved by Citroen under the designation ‘LHM’ for its exclusive use, where the tanks marked green are found.
LHM is not miscible with other currently used brake fluids meeting DOT 3 or DOT 4 requirements. In case of accidental mixing, draining of the hydraulic braking system is mandatory.

UNE 26-090-88
ISO 7308