Porsche 911 Carrera - Manual (Page 237)

Engine Oil
Engine oil consumption
It is normal for your engine to consume oil. The
rate of oil consumption depends on the quality
and viscosity of oil, the speed at which the engine
is operated, the climate, road conditions as well
as the amount of dilution and oxidation of the
lubricant.
If the vehicle is used for repeated short trips, and
consumes a normal amount of oil, the engine oil
measurement may not show any drop in the oil
level at all, even after 600 miles (1,000 km) or
more. This is because the oil is gradually becoming
diluted with fuel or moisture, making it appear
that the oil level has not changed. The diluting
ingredients evaporate out when the vehicle is
driven at high speeds, as on an expressway,
making it then appear that oil is excessively
consumed after driving at high speeds.
If the conditions you drive your vehicle in are dusty,
humid, or hot, the frequency of the oil change
intervals should be greater.
If the vehicle is driven at a high rate of speed,
climatic conditions are warm, and the load is
high, the oil should be checked more frequently,
as driving conditions will determine the rate of oil
consumption.
–
The engine in your vehicle depends on oil
to lubricate and cool all of its moving parts.
Therefore, the engine oil should be checked
regularly and kept at the required level.
– Make it a habit to have the engine oil level
checked at every refueling.
– The oil pressure warning light is not an oil
level indicator. The oil pressure warning light
indicates serious engine damage may be
occuring when lit, if engine rpm is above idle
speed.
Maintenance, Car Care
235