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Since I bought my RS-6 several years ago, there has been an evolution in Castrol products and I was wondering what is now recommended for the RS-6. My car is used mainly in spring/summer in Europe and I drive fairly quick.

What I hear is that Castrol Longlife III is very good, but it is offered in several grades from 0W-30 > 5W-30 > 10W-40, ranging in VW spec 503.01, 502, 504 00, 505, 507 00

Let me know what your favorites are.

Thanks!

Note that the oil specified for the RS6 is to specification VW 505.01. This is the oil which is normally used for diesel PD engines without variable service interval. This has traditionally been a 5W-40 weight.

Volkswagen Group Oil Specifications and their Applications

VW 500.00
This is an “old” oil specification and is applicable to engines built before model year 2000 (up to August 1999)
Viscosity ratings: SAE 5w-40, 10w-40 or 20w-40
This oil can be used in all petrol and some diesel engines, apart from those referred to under other specifications.

VW 501.01
This is another “old” oil specification with exactly the same application as
VW 500.00.
Viscosity ratings: SAE 10w-40, 15w-40 or 20w-40

VW 502.00
This oil can only be used in petrol engines and is recommended for those which are subject to arduous conditions. It must not be used for any engines with variable service intervals or any which are referred to under other specifications.
Viscosity ratings: SAE 0w-40, 5w-40 or 10w-40

VW 503.00
This is a relatively new oil specification for petrol engines with variable service intervals. It includes the AUDI S4, but not the RS4, or the TT and S3 with outputs of more than 180bhp.
Viscosity rating: SAE 0w-30

VW 503.01
A new oil specification specifically for the RS4, and the TT and S3 with outputs of more than 180bhp, Passat W8 and Phaeton W12.
Viscosity rating: 0w-30

VW 505.00
For all diesel engines prior to model year 2000 (August 1999)
Viscosity rating: 0w-40, 5w-40 or 10w-40

VW 505.01
For all diesel engines with unit injectors (Pumpe-Duse or PD) without variable service intervals.
Viscosity rating: SAE 5w-40

VW 506.00
For all diesel engines except those with unit injectors, with variable service intervals.
Viscosity rating: SAE 0w-30

VW 506.01
For all diesel engines, including those with unit injectors, with variable service intervals.
Viscosity rating: SAE 0w-30

Hope this helps.

Simon

oilman wrote:.........
Hope this helps.

Simon

So, which oil would you sell for the RS6? I've looked through the specs on your website for all the Castrol oils you carry and none mention VW505.01, which is what my RS6 Owner's Manual specifies.

I assume by the spec that your car has a PD engine.

We only carry 2 PD products.

Fuchs Titan Supersyn SL LL 0w-30
Fuchs Titan Supersyn SL PD (Plus) 5w-40

Cheers
Simon

I believe this is the oil you need:

http://www.castrol.com/castrol/productd ... Id=7009125

I have a container of VW group oil in front of me:

For vehicles without extended service intervals. Approved in accordance with VW 505 01, VW 505 00 or VW 500 00.

Audi Part Number: G 052 167 A2
ACEA A3-96/B3-96
SAE 5W-40
API SJ/CF

oilman wrote:I assume by the spec that your car has a PD engine.

Nope! The RS6 has a V8 4172cc twin turbo petrol engine. The oil specified for this engine is 505.01.

Interesting the VW505.01 is normally a PD oil spec.

What year is the car?

And is it on variable servicing or fixed servicing schedual?

Cheers

Simon.

The car is 2003 production. The RS6 is not eligible for a variable service interval regime.

After more research and a reply from Castrol in the UK:

Audi has now recommend the use of VW 504 00/507 00 5W-30 across the whole
Audi range - including the RS4 and RS6 so the Castrol product in this
case would be EDGE 5W-30. (In France it's called SLX Longlife III)


According to Castrol, the EDGE Turbo diesel 5W-40 which meets the VW 505
01 is very good. ( Ignore the "Turbo diesel" name - it is suitable for
petrol and it meets the important VW 505.01 spec )

Should the EDGE product not be available, Castrol TXT 505.01 can be used

The new 504 and 507 is a catch all spec that covers all old specs.

Cheers
Simon

As a slight side issue. I have been using an oil additive from BRISK in Germany for the past 6 months. You add one bottle and after about 200 miles you notice that the engine is smoother at high revs and seems to be more responsive.