Choice of Oil ?

[PipRS6]

Why?

Because it says "Sport" on the bottle.....

[MikeFish]

Or from site Sponsor Opie Oils. Do they still do the RS246 discount?

https://www.opieoils.co.uk/p-60457-cast ... e-oil.aspx

Yes you still do get discount Use code RS246 at the checkout.

Cheers,

Guy

Bugger, I bought some at the weekend and forgot to use the code.

[MikeFish]

https://www.halfords.com/motoring/engin ... -30-oil-5l

This was the one, I'm fairly sure. Doesn't state 505.01 on the site, but it does say it on the back of the bottle.

Currently less than £30 for 5L. Much cheapness.

[PipRS6]

https://www.halfords.com/motoring/engin ... -30-oil-5l

This was the one, I'm fairly sure. Doesn't state 505.01 on the site, but it does say it on the back of the bottle.

Currently less than £30 for 5L. Much cheapness.

Even cheaper if you have a trade card

[oilman]

Why?

The 505.01 spec is the PD spec for pd engines on fixed service, the VW502 spec is a very low spec. That oil is essentially built to a spec and nothing more, the 505.01 spec for PD engine is to keep the anti wear additives up to protect the cam lobes that drive the pd pump. This doesn't mean the 505.01 spec is something special, it is just to stop pd engines running sub standard oils such as 502.00 only.

The Motul Sport is a group V ester synthetic designed for performance use, its in a different league to the Motul Specific 505.01/502.00

Cheers,

Guy

[Mɐʇʇ]

Are the Motul 505.01 and Castrol Edge oils ester synthetics?

[Shoppinit]

Good question. I can't believe they are allowed to market semi-synthetics as synthetics in this country. Is there a way of telling? I've looked at the MSDS before but it's not easy to interpret.

[Mɐʇʇ]

TBH I think, as a function of marketing, we all get a bit too hung up on oils. Rule 1 - choose the right hot spec. Rule 2 - choose a low W spec. Rule 3 - change it frequently.

[Shoppinit]

I think that's true for "normal" cars, but the RS6 has specific demands due to the placement of the turbos and the extreme heat conditions. Mineral oils and semi-synth are the devil's oil, but there's no clear way of telling whether it's synthetic or not. Unless you are in Germany.

[Mɐʇʇ]

yeah, but even inside 505.01, everyone debates this vs that.

On my boat motor, people still promote mineral oils just because they’ve never had a blowup, and will argue about it endlessly. Or they’ll promote a higher W rating because 5w is too thin. WTF.

[philS2]

I see on OEMPC that the approval is 504.00.

I'm just looking for something I read the other week that stated the same.

It was a very specific BCY/BRV/official text.

I actually used some Castrol Edge 505.01 and it burned it like it was going out of fashion.

Tried some MPM engine oil, and it's better. (ironically it's 502.00, 505.00, AND 505.01).

I have some Castrol Edge 504.00 to put in next, so I'll see how that goes.

[Shoppinit]

Quattro Gmbh recommended 504.00 if you can't find any 505.01. Maybe this is what you were thinking of?

[philS2]

Not sure, I'll keep searching.
It basically said that 504.00 supercedes everything before.
Not sure when it was typed though.

[oilman]

Are the Motul 505.01 and Castrol Edge oils ester synthetics?

No they are not ester synthetics. The Motul 505.01 will be classed as a group III hydrocracked synthetic and depending which Castrol edge it is it will be either a group IV synthetic or group III synthetic.

0w oils are all true group IV synthetics as it is the only way to achieve the 0w viscosity.

Cheers,

Guy

[oilman]

Good question. I can't believe they are allowed to market semi-synthetics as synthetics in this country. Is there a way of telling? I've looked at the MSDS before but it's not easy to interpret.

It is a bit of a grey area this, semi synthetics are generally not sold as synthetics as they are a blend of mineral and synthetic, however where it gets confusing is a synthetic can be made from a group III hydrocracked mineral oil. So you can have a semi synthetic that is made up of 100% mineral base stock and you can even have a synthetic made up of 100% mineral base stock. It is very hard to tell what is what sometimes.

The reason in the UK oil manufacturers can legally call a group III hydrocracked oil a synthetic is due to a spat between Mobil and Castrol, I have an article on it somewhere I will dig it up.

Cheers,

Guy