Automatic Transmission Fluid (Atf) - Porsche 928 1980 Owner's Manual

Manual transmission oil
The transmission oil has to be changed at
the intervals listed in your Maintenance
Schedule.
Hypoid oil SAE 75W 90 labeled "For Service
API/GL5 or Mil-L 2105B" must be used for
the manual transmission (also for limited
slip differential). Also see "Filling Capac-
ities".
We recommend that you have the transmis-
sion oil changed at your Porsche dealer,
who has the required lubricants and the
necessary filling equipment.
If you suspect an oil leak in the transmis-
sion, have your dealer check it out immedi-
ately.
52
Automatic transmission fluid
The torque converter and the transmission
are lubricated with Automatic Transmission
Fluid (ATF). The final drive requires hypoid
oil SAE 90 only.
Do not tow the car or run the engine with-
out ATF in the transmission.
The automatic transmission may be da-
maged by even a tiny speck of dirt. Only
a clean funnel or spout must be used
when adding ATF.
Checking the ATF level
The ATF should be checked at the intervals
listed in your Maintenance Schedule. A
correct ATF level is very important for the
proper functioning of the transmission.
The reading should be done when the ATF
is warm, with the engine idling, the selector
lever in Neutral and the parking brake ap-
plied.
The level of the ATF can be checked visually
through the transparent reservoir, located at
the rear end of the transmission housing.
You have enough ATF, if the fluid level is
between the MAX and the MIN mark on the
reservoir. The level should never be above
or below these two marks.
Should the fluid level in the transparent re-
servoir drop below the MIN mark or rise
above the MAX mark, do not just add or drain
ATF. Have your dealer check and correct the
cause promptly.
In the event of a noticeable loss of ATF,
contact your dealer immediately.
Changing the ATF
The ATF has to be changed at the intervals
listed in your Maintenance Schedule.
When refilling, the level must reach the
mark below the MIN mark. Also see "Fill-
ing Capacities". The hypoid oil in the final
drive does not have to be changed.