When searching for the above, i came across 5w40 oils & 0w30 oils as well as 5w30's.

As long as it has the vw502 approval, surely anyone of these can be used?

So, is anyone on fixed servicing using either 5w40 or 0w30 as opposed to 5w30?

See here:

http://www.opieoils.co.uk/c-742-vw-engine-oil.aspx

VW 500.00 oil

Oils listed in this section meet the VW 500.00 specification. This is an “old” oil specification and is applicable to engines built before model year 2000 (up to August 1999). Oils with an approval made post March 1997 will have been given an alternative, later VW specification.

This oil can be used in older petrol and some diesel engines, except from those referred to under other specifications. Not suitable for vehicles using extended service intervals.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 501.01 oil

Oils listed in this section meet the VW 501.01 specification. This is an “old” oil specification and is applicable to engines built before model year 2000 (up to August 1999). Oils with an approval made post March 1997 will have been given an alternative, later VW specification.

VW 501.01 is very similar to the VW 500.00 specification, and can be used for the same applications in older petrol and some diesel engines, except those referred to under other specifications.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 502.00 oil

Oils listed in this section meet the VW 502.00 specification.

Oils meeting this specification should only be used in petrol engines. 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.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 503.00 oil

Oils listed in this section meet the VW 503.00 specification. This specification is for petrol engines with extended service intervals (up to 30,000km or 24 months).

It includes the AUDI S4, but not the RS4, the TT, S3 or A8 6.0 V12 with outputs of more than 180bhp, which should use oils meeting the VW 503.01 or VW 504.00 spec. VW 503 00 is now superceded by the VW 504.00 specification.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 503.01 oil

Oils listed in this section meet the VW 503.01 specification. This specification is specifically for Audi RS4, Audi TT, S3 and Audi A8 6.0 V12 models with outputs of more than 180bhp, running with variable service intervals (30,000km or 2 years). Now superceded by the VW 504.00 specification.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 504.00 oil

Oils listed in this section meet the new VW 504.00 specification. These oils are suitable for all petrol engines with extended service intervals (30,000km or 2 years).

The VW 504 00 specification supercedes the VW 503 00 and VW 503.01 specifications. VW 504 00 oils are suitable for engines meeting the demands of Euro IV emissions standards.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 505.00 oil

The oils in this section meet the the VW 505.00 specification; the oldest VW specification for diesel cars. Now only really relevant only to pre 2000 diesel cars (with or without turbocharger). For diesels from 2000 onwards, the VW 505.00 specification has largely been superceded by the 505.01, 506.00, 506.01 and 507.00 specifications.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 505.01 oil

The oils in this section meet the VW 505.01 specification. These oils are especially for "Pumpe-Düse" (unit injector or "PD" engines) running on fixed service intervals (15,000km / 12 months).

It is vitally important to use an oil meeting either this, the VW 506.01 specification or the VW 507.00 specification to avoid damaging the diesel pump in PD engines.

For PD engined cars with a DPF, use only an oil meeting the VW 507.00 specification.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 506.00 oil

Oils in this section meet the VW 506.00 specification. These oils are suitable for diesel engines with extended service intervals of up to 50,000km / 2 years. Not for use on engines with a single injector pump. Oil change is indicated by the electronic service indicator.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 506.01 oil

The oils in this section meet the VW 506.01 specification. These oils are especially for "Pumpe-Düse" (unit injector or "PD" engines) running on extended service intervals (30,000 - 50,000km / 24 months). Oil change is indicated by the electronic service indicator.

It is vitally important to use an oil meeting either this, the VW 505.01 specification or the VW 507.00 specification to avoid damaging the diesel pump in PD engines.

For PD engined cars with a (DPF), use only an oil meeting the VW 507.00 specification.

Don't know what oil specification you need? Use our engine & gearbox oil guide.

VW 507.00 oil

The oils in this section meet the VW 507.00 specification. These oils are suitable for almost all VAG diesel engines from 2000 onwards with extended service intervals, unitary injector pumps and also Pumpe-Düse ("PD") engines.

Excludes V10, R5 engines and VW Commercial vehicles without fitted DPF (diesel particulate filters) – these must use a 506 01 specification oil.