Yep that’s what it says on the W12 too. And that’s what I use on the VR6 3.2.


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I know that 98 ron is what is recommended for the Touareg and that's what I fill mine with. On the inside of the fuel filler door it says that "Minimum ron should be 95. 98 is recommended." And I believe in the owner's manual it says that although 98 is the recommended fuel octane, however 95 can be used but with less power output from the engine. If that's for the V6, then I'm sure it's a no-brainer to use 98 ron (or equivalent 93 octane in the U.S.) for the V8 and W12 as well.

 

Left engine cover cleaned and put back with its new VW sourced gasket and the spark plug gaskets. Torqued to spec except one corner bolt torqued as best we could.
New spark plugs torqued to spec: 30nm.
New pcv membranes. Custom made pcv hose for the left engine.
13 liters of castrol 5w30 507.00 spec.
New speed sensor put in.
A coolant flush which took about 18 liters of bottle water then 13 liters of g12evo.
Engine started fine and runs fine except:
First cold start takes two attempts. Previous owner was using ethanol. We will be putting in 98 ron to see if that solves the cold start issue. Might be fuel pressure related. Next on the test list.


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This design has caused some enormous trouble for car owners over time. Why do they keep using crappy material I don’t know. They want you to keep giving them your money of course. And this is a critical component !!


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If we made a list of the crazy decisions VW has made for just the Touareg...it'd be a long one.

 

Will post part numbers later on.

 

Next on the list:
We are removing the valve covers to inspect.
12 spark plugs (NGK) =>
12 Spark plug seals =>
Maybe 12 coil pack if we find any surprises.
2 valve cover seals
12 spark plug valve cover seals.

The W12 has a hard time starting. It takes a few button pushes and even key insertion and gaz pedal applying.
It cranks but does not start. After 4 or 5 attempts it does fire then drives fine.
It runs very lean. This is most probably due to the torn pcv membrane. But it drives smooth.
I'm thinking of putting in a new speed sensor, the famous G28. I couldn't find where they hid it on the W12 then came across this video. So for all of you W12 owner looking for the location of the speed sensor or the impluse sender or the the crank sensor G28 here is a deutsche video

 

Link for the membrane:

Pardon Our Interruption...

AUDI 4.2 5.2 6.0 A6 C6 A8 D3 Q7 CRANKCASE BREATHER VALVE OIL SEPARATOR DIAPHRAGM

 

Been there, done that. I replaced the membrane on the 3.6 VR6 by one from RKXTech. Easy job (this coming from someone with very basic mechanical skills). It felt good when I started the car afterwards and the hissing went away.

 

And first issue found is a blown pcv membrane. The W12 has it all in pairs so you have two PCV or oil separators. The left one (bank 1 = passenger side for a LHD) was torn. You need to remove the intake manifold to get to it. The intake manifold is a magnesium solid piece. It can be separated into 3 parts but you better get it in a single. A buck and screws and some hose disconnecting and you lift it off.

Some pics of the torn membrane. The right side is pretty tired too. Both have already been replaced I think. The oil separator block goes for around 200€. So I orderd two rubber diaphragms from Poland. 40€ shipping included.

Note for the PCV on some W21 version, probably US models on the phaeton.: the PCV is not the same design. So careful when buying the membrane.

The exact dimensions taken form a Russian pcv sendor just for reference if you want to make it yourself

 

 

Tearing down the W21... Well not that quick ! this is just removing the intake and exploring the beast...
I'm adding pictures here to help future W12 owners looking for details and pics and part location.

 

Nope.
The W12 for both T1 and T2 is an MPI engine. MPI stands for MultiPoint Injection or Port Injection.
The carbon buildup issue is for Direct Injection engines.
Carbon buildup is all that blowby being reinjected through the intake for combustion.
In Port injection fuel is injected, along with that blowby, in the port above the valves which keeps them clean. In Direct injection fuel is injected inside the cylinder below the valves so you lose the valve cleaning effect of all the blowby coming through the intake port.
You will find some slight buildup (slight soot inside the port ) on MPI engines but nothing to do with FSI or GDI engines.

Here is a video explaining all this.

 

Its a wonderful vehicle & engine. Is it prone to carbon build up?

 

This vehicle a super model. Rare, beautiful, expensive and it makes men drool.

 

Thanks for sharing [emoji106]


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It is a beast!

Not many people know the W12 first appeared in the VW Nardo, a prototype which ran for 24 hours on the Nardo Ring in southern Italy at an average speed of 200 mph!

I've been to the Nardo and circulated in a Jaguar prototype at 150mph which was pretty hairy.

200 plus would have been something else again, especially during the night!

The circuit has a manager whose sole role is to liaise with the local mafia! One of the Jaguar engineers got a tad too friendly with a local girl and had to be shipped home, pronto Tonto!

Twenty Years Ago, the Volkswagen W12 Nardo Broke Seven World Speed Records

The first full-blown supercar to don Volkswagen badges was not just a showpiece, but a fully functional beast that proved the superiority of the W engine configuration.

www.autoevolution.com

 

Will start looking into it soon.
Here is a pic of the engine specs (T1 W12 BJN engine).
VW Made two other engine versions for the T2.

 

Nice find!
Weren't that generation susceptible to water under the drivers carpet near a wiring loom which caused deterioration of the wires? With so many faults in different modules I'm wondering if that might be the cause.
Although that low battery voltage is suspect as well.

 

And here is the VCDS log:

-------------------------------------------------------------------------------
Address 01: Engine Labels: 07C-906-018-BAP1.lbl
Part No SW: 07C 906 018 BF HW: HARDWARE NO
Component: MAC-6.0L-AG-EU4 G ª6725
Revision: --H01--- Serial number: VWZ3Z0E3417205
Coding: 0000173
Shop #: WSC 00000 000 08192
VCID: 6AE392537054B9281E-515A

1 Fault Found:
005784 - Please Check DTC Memory of Steering Wheel Electronics
P1698 - 001 -
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 152287 km
Time Indication: 0

Freeze Frame:
RPM: 0 /min
Load: 0.0 %
Speed: 0.0 km/h
Temperature: 7.0°C
Temperature: 19.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 11.430 V

Readiness: 0110 1001

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 09D-927-750.clb
Part No: 09D 927 750 EF
Component: AL 750 6A 0790
Coding: 0004200
Shop #: WSC 31414 000 00000
VCID: 76F7BA37001071FCFE-5178

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 7L0-907-379-MK25.lbl
Part No: 7L0 907 379 G
Component: ESP ALLRAD MK25 0203
Coding: 0022786
Shop #: WSC 31414 000 00000
VCID: 3DBE28D83C75A76FB6-5178

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. Labels: 3D0-909-13x-05.lbl
Part No SW: 3D0 909 137 B HW: 5WK 484 95
Component: 08 Kessy 6700
Revision: 67005715 Serial number: VWZ3Z0E3417205
Coding: 0147688
Shop #: WSC 31414 000 00000
VCID: 26A71A0740E011CC7E-515A

Subsystem 1 - Part No: XXXXXXXXXXX
Component: ELV XXXX

1 Fault Found:
00181 - Access/Start Authorization Antenna (in Rear bumper) (R136)
011 - Open Circuit

-------------------------------------------------------------------------------
Address 06: Seat Mem. Pass Labels: None
Part No: 7L0 959 760
Component: Sitzverstellung 0701
Shop #: WSC 00000 000 00000
VCID: 77F4B40A04170BF5E6-5178

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: None
Part No: 7L6 907 044 K
Component: CLIMAtronic 2+2 4021
Coding: 0000030
Shop #: WSC 31414 000 00000
VCID: 3CB12EC5387EAD568E-515A

Subsystem 1 - Part No: 7L6 907 049 E
Component: CLIMAtronic FOND 0400

1 Fault Found:
01810 - Actuating Motor for Temperature Flap; Right (V159)
000 - -

-------------------------------------------------------------------------------
Address 09: Cent. Elect. Labels:. 7Lx-937-049-V1.clb
Part No: 7L6 937 049 M
Component: 3001
Coding: 0122108
Shop #: WSC 31414 000 00000
VCID: 46C7DAA7C000512C7E-5178

1 Fault Found:
00907 - Intervention load Management
000 - -

-------------------------------------------------------------------------------
Address 11: Engine II Labels: 07C-906-018-BAP2.lbl
Part No SW: 07C 906 018 BF HW: HARDWARE NO
Component: MAC-6.0L-AG-EU4 G ª6725
Revision: --H01--- Serial number: VWZ3Z0E3417205
Coding: 0000173
Shop #: WSC 00000 000 08192
VCID: 6AE392537054B9281E-5178

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 3D0-909-601.lbl
Part No: 3D0 909 601 E
Component: 0B Airbag 8.4E+ H10 0951
Coding: 0012354
Shop #: WSC 31414 000 00000
VCID: 25A618005CED173776-5178

2 Faults Found:
00588 - Airbag Igniter; Driver Side (N95)
001 - Upper Limit Exceeded - MIL ON
01587 - Igniter 2 for Airbag; Drivers Side (N250)
001 - Upper Limit Exceeded - MIL ON

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 7L6-953-549.lbl
Part No: 7L6 953 549 D
Component: Lenksäulenmodul 3301
Coding: 0000032
Shop #: WSC 31414 551 00000
VCID: 40BD26D12862B572AE-5178

1 Fault Found:
01426 - Controls in Steering Wheel (E221)
004 - No Signal/Communication

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 7L6-920-xxx-7LA.lbl
Part No: 7L6 920 881
Component: KOMBIINSTRUMENT RB8 3111
Coding: 0007111
Shop #: WSC 12345 123 01625
VCID: 75F6B8301C1D77E7F6-5178

1 Fault Found:
00470 - Company Comfort Databus in Single Wire
012 - Electrical Fault in Circuit

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl
Part No: 6N0 909 901
Component: Gateway K<>CAN 0101
Coding: 0000006
Shop #: WSC 12345 123 01625
VCID: 70ED8621687255C22E-515A

1 Fault Found:
00470 - Company Comfort Databus in Single Wire
012 - Electrical Fault in Circuit

-------------------------------------------------------------------------------
Address 1C: Position Sensing Labels: 7L6-919-879.lbl
Part No: 7L6 919 879 A
Component: JCI PathPoint 2200
Shop #: WSC 00000 000 00000
VCID: 45C6D8A0DC0D571776-515A

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD Labels: None
Part No: 0AD 927 755 BE
Component: TRANSFERCASE 0122
Shop #: WSC 00000 000 00000
VCID: 7FFCA412242F3BBDA6-515A

No fault code found.

-------------------------------------------------------------------------------
Address 32: Differential Locks Labels: None
Part No: 0AC 927 771 C
Component: SG-Quersperre 5020
Shop #: WSC 00000 000 00000
VCID: 38B536C9084A854AEE-5178

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control Labels: 7Lx-907-553-34.clb
Part No: 7L0 907 553 F
Component: LUFTFDR.-CDC- 3C3P1 3081
Coding: 0015521
Shop #: WSC 31414 000 00000
VCID: 36B73AF70050F1BCFE-515A

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 7L0 959 760
Component: Sitzverstellung 0701
Shop #: WSC 00000 000 00000
VCID: 77F4B40A04170BF5E6-515A

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation Labels: 7L6-919-887-DVD.lbl
Part No: 7L6 919 887 H
Component: Navigation 0028
Coding: 0000101
Shop #: WSC 31414 000 00000
VCID: 4BC0CCB6F42B73C106-5178

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 7L0-959-933.lbl
Part No: 7L0 959 933 F
Component: 34 HSG 0300
Coding: 0000069
Shop #: WSC 31414 000 00000
VCID: 3FBC24D2246FBB7DA6-FFFE

Subsystem 1 - Part No: 7L0 959 701 H
Component: Tuersteuergeraet FS 0201

Subsystem 2 - Part No: 7L0 959 702 H
Component: Tuersteuergeraet BF 0201

Subsystem 3 - Part No: 7L0 959 703 D
Component: Tuersteuergeraet HL 0201

Subsystem 4 - Part No: 7L0 959 704 D
Component: Tuersteuergeraet HR 0201

Subsystem 5 - Part No: 7L0 907 719 A
Component: Neigungssensor 0020

Subsystem 6 - Part No: 7L6 951 171
Component: B Innenraumsensor 0020


-------------------------------------------------------------------------------
Address 47: Sound System Labels: 7Lx-035-4xx-47.lbl
Part No: 7L6 035 456
Component: 08K Audioverst. 0105
Shop #: WSC 00000 000 00000
VCID: 70ED8621687255C22E-515A

Subsystem 1 - Part No: 7L6 035 456
Component: 08K Audioverst. 0105
Note: Excessive Comm Errors


-------------------------------------------------------------------------------
Address 55: Headlight Range Labels: 7L6-907-357-A.lbl
Part No SW: 7L6 907 357 C HW: 7L6 907 357 C
Component: AFS-Steuergeraet 0147
Revision: 00H04000 Serial number:
Coding: 2271234
Shop #: WSC 00235 223 90217
VCID: 3BB02CC6347B935186-515A

Subsystem 1 - Part No: 7L6 941 329 Labels: 3D0-941-329.CLB
Component: AFS-Lst.-Modul l X017
Coding: 00000034

Subsystem 2 - Part No: 7L6 941 330
Component: AFS-Lst.-Modul r X017
Coding: 00000034

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio Labels: 7L6-035-186-DVD.lbl
Part No: 7L6 035 186 C
Component: Radio 0028
Coding: 0016042
Shop #: WSC 31414 000 00000
VCID: 33A83CFE14A3E3A9C6-515A

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure Labels:. 7L6-907-273.lbl
Part No: 7L6 907 273 B
Component: Reifendruckueberw. 0053
Coding: 0111390
Shop #: WSC 31414 000 00000
VCID: 37B434CA04578BB5E6-5178

No fault code found.

-------------------------------------------------------------------------------
Address 68: Wiper Electr. Labels: 7L0-955-119-V2.clb
Part No: 7L0 955 119 K
Component: Front Wiper 4027
Coding: 0000343
Shop #: WSC 31414 000 376832
VCID: 3CB12EC5387EAD568E-5178

Subsystem 2 - Part No: 1K0 955 559 T Labels: 1K0-955-559-AF.CLB
Component: RegenLichtSens 011 1110
Coding: 00208933
Shop #: WSC 31414

1 Fault Found:
00003 - Control Module
014 - Defective

-------------------------------------------------------------------------------
Address 6E: Ctrl Head Roof Labels: None
Part No: 7L6 919 044 N
Component: DACHDISPLAY 0539
Revision: 00800539 Serial number: 2009289.07
Shop #: WSC 31414 000 00000
VCID: 42BB22ABD01C49005E-5178

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist Labels: Redir Fail!
Part No: 7L0 919 283 F
Component: 0E Einparkhilfe 1107
Shop #: WSC 00000 000 00000
VCID: 39B230CC0C419F4396-5178

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone Labels: Redir Fail!
Part No SW: 7L6 035 729 F HW: 7L6 035 729 F
Component: FSE_275x H18 0020
Revision: 00000001 Serial number: 00000000325420
Coding: 0000211
Shop #: WSC 31414 000 00000
VCID: 39B230CC0C419F4396-5178

1 Fault Found:
02503 - Output Wire to Radio
011 - Open Circuit
Freeze Frame:
Fault Status: 01101011
Fault Priority: 5
Fault Frequency: 1
Reset counter: 24
Time Indication: 15

 

A quick check in ElsaWin. This thing needs 14 liters of engine oil
Which is normal since it is basically a 2xVR6 engines crammed together.

 

And the guy kept the air boxes so we're putting them back.

 

Good for you, Put the factory air boxes back in for sure. Get rid of those dumb cone filters. Use OEM filters.

 

 

This is a very, very rare car!

 

Yep. 450HP under the hood !
The owner was at his wit's end with it I guess. He just couldn't handle all the errors. And the suspension was throwing errors all the time. He did replace the compressor and the air distribution bock but still couldn't fix it. So he decided to get rid of it. My friend already has a VR6. Now he has a VR6 and Double VR6
One thing to note the intake system is less complicated than the VR6. There is no variable intake voodoo. Less vacuum hoses to fight with. But it has some leaks we are trying to pinpoint, maybe a hydraulic steering leak and a coolant leak. Transmission looks fine and gear changes are good.

 

Nice...are you the latest "le professeur?" [emoji6]

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No wayyyy
The W12 is not in a bad shape. It does drive fine but has several errors in the vcds log.
Fuel trim issues, suspension issues, kessy issues, wiper module issues and so on.
I will post an initial vcds log I took before erasing all errors.
I will let him drive it a bit then scan it again.