Mercedes-Benz SL 320 Operator's Manual page 86

Engine Oil Consumption
Engine oil consumption checks should
only be made after the break-in period.
During the break-in period, higher oil
consumption may be noticed and is
normal. Frequent driving at high
engine speeds results in increased
consumption.
Fuel Consumption Gauge
While driving, instantaneous fuel
consumption is indicated in miles per
gallon (mpg), or in Canada liters per
100 kilometers (I/100 km).
With the engine switched off, the
needle reads "0".
Due to system design, maximum
consumption is indicated at idle speed.
Tachometer
Red marking on tachometer:
Excessive engine speed.
Avoid this engine speed, as it may
result in engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.
For engine protection, the fuel supply
is interrupted if the engine is operated
within the red marking.
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