CITROEN 2 CV4 1975 Owner's Manual page 23

MAINTENANCE
Maintenance
Periodic Maintenance Operations
These are indicated in the "Maintenance Guide", which
accompanied the car when first delivered. We would recommend
you to adhere to the frequencies indicated and would remind you
that we recommend "TOTAL" lubricants.
All mixtures and experiments are forbidden, and, in particular, the
use of oil additives of any kind, as these may lead to serious trouble.
Never grease or lubricate the rubber mounted link situated under the
bonnet, above the gear change lever. Never grease or lubricate the
gear change lever.
TYRES: "MICHELIN" (Do not use tyres other than those we
recommend.)
Series fitted: 125-15 X
Authorized series: 135-15 X, 125-15 X (M+S), 135-15 X (M+S),
135-15 ZX
Pressures: 20 psi (1,4 bar) at front, 26 psi (1,8 bar) at rear, 29 psi
(2 bars) on spare wheel.
These pressures apply to laden or empty vehicles, on an ordinary
road or on a motorway, whatever the speed. On authorized series
135-15 ZX, the pressures should be modified in certain cases: on
Mechanical and Electrical