engine oil AUDI A6 1999 C5 / 2.G AEB ATW Engines Lubrication System Components User Guide

17-22

Oil pressure and oil pressure switch,
checking


Function of dynamic oil pressure warning
system

Warning lamp, checking
With engine switched off and ignition on (terminal
15 on), oil pressure warning lamp will be lit (not
for vehicles with Auto Check system).

Warning criteria

Engine switched off and oil pressure switch
closed.
Coolant temperature less than 60 C (140
F), engine speed higher than 300 RPM and
oil pressure switch open.

Coolant temperature greater than 60 C
(140 F).

At engine speeds greater than 5000 RPM,
an active oil warning won't be erased
independent of oil pressure switch setting.
A Diagnostic Trouble Code (DTC) is
recognized when oil pressure switch is open
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Special tools and equipment

VAG1342 oil pressure tester
VAG1527B voltage tester
VAG1594A measuring appliance adapter

Test conditions
Oil level OK
Oil pressure warning light -K3- must light up
when ignition is switched on.
For vehicles with Auto Check system, "i.O"
indicator must be lit (call up symbol)
Engine oil temperature approximately 80 C
(176 F)
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17-24

Oil pressure switch, checking

- Disconnect line from oil pressure switch.

Note:
While starting engine, watch pressure tester and LED as oil pressure
switch may open during start. - Remove oil pressure switch and install VAG1342 oil pressure tester.
- Install oil pressure switch into VAG1342 oil pressure tester.
- Connect brown wire -1- of tester to Ground (GND).
- Using VAG1594 adapter, connect VAG1527B voltage tester to oil
pressure switch and Battery Positive Voltage (B+).
LED must not be lit.
- If LED is lit, replace oil pressure switch.
- Start engine.
At 1.2-1.6 bar (17.4-23.2 psi) LED must be lit.
- If LED does not light, replace oil pressure switch.
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Oil pressure, checking

- Disconnect line from oil pressure switch.

If specified values are not obtained, the pressure relief valve or the oil
pump is faulty. - Remove oil pressure switch and install VAG1342 oil pressure tester.
- Install oil pressure switch into VAG1342 oil pressure tester.
- Start engine.
Engine oil temperature approximately 80 C (176 F). Oil pressure at idle: 1.0-3.5 bar (14.5-50.75 psi)Oil pressure at 3000 RPM: 5.0-7.0 bar (72.5-101.5 psi)
- Replace oil pump Page 17
-21
.
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17-26

Engine oil

Engine oil capacity (w/filter): 3.5 L (3.7 qt.).
The engine is factory-filled with a high quality
multi-grade oil that can be used as an all-season
oil, except in extremely cold climates.

Viscosity classes and oil specifications

Select the viscosity according to the chart shown. The oil does not need
to be changed if the outside temperature only briefly exceeds the
specified ranges.
The specifications stated on these pages must be indicated on the
container either individually or in combination with other specifications. 1) This VW specification must have a date of 10/91 or later. 2) These oils may only be used in exceptional cases if no approved
engine oil is available.
Mixing oils when topping up is permissible. A - Multi-grade oil, specification VW 500 00
1)
B - Multi-grade oil, specification VW 501 01
1)
- Multi-grade oil, specification API-SF- or -SG-
2)
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Oil level, checking


Test conditions

Minimum engine oil temperature: 60 C
(140 F)

Vehicle on level ground
After stopping engine, wait a few minutes to
allow oil to flow back into oil pan

- Withdraw dipstick, wipe off using clean cloth and
reinsert fully.

- Withdraw dipstick again and read oil level.

Range of markings on dipstick:
CAUTION!
Do not overfill with oil past the MAX mark on the oil dipstick.
Damage to the Three Way Catalytic Converter (TWC) could result. a - Oil MUST NOT be topped off.
b - Oil may be topped off. After topping off, oil may reach range -a-.
c - Oil MUST BE topped off. After topping off, it is sufficient if oil level is
somewhere in range -b- (shaded area).
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