Mercedes-Benz 420 SEL 1988, Owner'S Manual

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MERCEDES-BENZ Maintenance
System
A maintenance booklet is included
with your car, listing all the mainte­
nance jobs that must be carried out
after the following mileages:
Routine Maintenance
Inspection at
1300-1600 km (800-1000 miles)
Lubrication Service every
12 000 km (7500 miles)
Maintenance Service every
24000 km (15 000 miles)
Additional Work every
48000 km (30000 miles)
For additional details refer to the
Maintenance Booklet.
In the case of low mileage operation,
the Maintenance Service must be
carried out at least once every
2 years.
Engine Oil and Filter Change
Required every 12 000 km
(7500 miles), or at least once a year
(fall) when using year-round multi­
grade oil; otherwise at least twice
a year (spring and fall).
For engine oil recommendations, see
page 105.
Severe Operating Conditions
Under severe operating conditions or
heavy use, it may be necessary to
carry out prescribed maintenance
jobs at shorter intervals, for example:
Engine: Oil change with filter change
every 6000 km (3750 miles)
Automatic transmission: Fluid
change without filter change every
24 000 km (15 000 miles)
Tires: Inspect every 12 000 km (7500
miles)
Air filter: Clean or replace element
every 24 000 km (15 000 miles)
Note:
Severe operating conditions or heavy
use include: predominant city or short
distance driving, frequent mountain
driving, poor roads, dusty or muddy
conditions, etc..
Special Maintenance Measures
Brake fluid should be replaced annu­
ally, preferably in the spring.
It is recommended to use only brake
fluid approved by MERCEDES-BENZ.
Do not mix different types of brake
fluids.
Have the engine coolant (water/anti­
corrosion/antifreeze mixture) replaced
every three years (see “ Fuels, Cool­
ants, Lubricants, etc.”).
Maintenance Vouchers
Your authorized MERCEDES-BENZ
dealer will certify in the maintenance
booklet that all lubrication and
maintenance services have been
carried out at the correct intervals.