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1 Maintenance
NOTE-
Castrol supplies the mineral and synthetic oil recommend-
ed by
BMW
BMW High Performance synthetic oil may be used in all
E39 models, regardless of year.
The use of engine oil additives is not recommended when
using BMW High
Performance synthetic engine oil.
* BMW is constantly upgrading recommendedmaintenance
procedures and requirements. The information contained
here is as accurate as possible at the time ofpublication. If
there is any doubt about what procedures apply to a spe-
cific
model or model year, or what intervals should be fol-
lowed, remember that an authorized BMW dealer has the
latest information on factory-recommended maintenance.
CAUTIOIG
In the case of cars that accumulate very low mileage per
yea/; BMW recommends that the engine oil should be
changed once
a year at a minimum, regardless of whether
mineral or synthetic based oil is used.
In the interest of engine longevity, use half
tlie recom-
mended engine oil change interval.
Engine oil, checking level
4 Engine oil level is checked with a dipstick (arrow) in the
engine block (6-cylinder oil dipstick shown,
V-8 dipstick is
similar).
- Check oil level with car on level surface, after engine has
been stopped for at least a few minutes.
- Check level by pulling out dipstick and wiping it clean
Reinsert it all the way and withdraw it again.
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I Radiator and Cooling System
I I 4 The cooling cassette incorporates cooling coils for various
vehicle systems:
1. Steering fluid cooler
2. Transmission oil
coolel
3. AIC condenser
4 In V-8 cars produced after 911998 (M62 TU engine), the en-
gine radiator is divided into an upper chamber (about 80%)
and a lower chamber (about 20%). The ATF heat exchanger
is coupled to the lower chamber.
On cold engine start-up, the engine coolant is heated more
quicltly than the transmission fluid. Heat from engine coolant
is used to warm up the ATF faster, reducing drag in the trans-
mission and improving fuel mileage.
Once the ATF has reached normal operating temperature,
the ATF heat exchanger acts as cooling device. The lower
20% of the radiator
stays cooler than the upper chamber, so
the ATF is cooled more effectively.
4 M62 TU cooling system ducting at radiator:
1. Coolant distribution housing connection
2. Thermostat connection
3. Water cooled alternator connections
4. Transmission fluid heat exchanger connections
