DDK - Die Deutschen Klassiker

And another one, this time porsche own label oil

https://www.design911.co.uk/p/porsche-c ... 004320929/

I can't find a data sheet for this so can't quantify things like zddp content.

I've also found a millers product but again issues with tech data download not working. They too have had an email for more info.

https://www.millersoils-shop.co.uk/clas ... engine-oil

Watched this previously, Slades Garage for VW’s he recommends a few oils with high ZDDP content, especially Lucas Oils.........
https://www.youtube.com/watch?v=qO_N75ReSjA

Millers classic has come back as approx 1100 - 1150.

I watched that slade video and another. One of them reckoned 1200 zddp to be ideal. More causes a build up of zinc which may be harmful. another says not a problem. a fair bit of blah blah blah. Also a fair bit on viscosity and geographical temperatures.

Going to be contacting porsche tomorrow for their classic engine oil spec.

I spoke to porsche centre in casnewydd and they said they cannot tell me the zddp content.

I'm not sure if the parts guy did not know it, couldn't find it or was not not permitted to tell me.

I'll leave that alone.

Dean.s wrote: ↑Wed May 20, 2026 3:06 pm I spoke to porsche centre in casnewydd and they said they cannot tell me the zddp content.

I'm not sure if the parts guy did not know it, couldn't find it or was not not permitted to tell me.

I'll leave that alone.

I was waiting for that reply, as others who have questioned what exactly makes THEIR Classic oil so special, with their advertising blurb on it, have come up with a similar brick wall. Why should the ZDDP content be such a big secret, unless of course it has none?

Nine One One wrote: ↑Wed May 20, 2026 3:33 pm

Dean.s wrote: ↑Wed May 20, 2026 3:06 pm I spoke to porsche centre in casnewydd and they said they cannot tell me the zddp content.

I'm not sure if the parts guy did not know it, couldn't find it or was not not permitted to tell me.

I'll leave that alone.

I was waiting for that reply, as others who have questioned what exactly makes THEIR Classic oil so special, with their advertising blurb on it, have come up with a similar brick wall. Why should the ZDDP content be such a big secret, unless of course it has none?

I have emailed porsche uk at reading for an answer. not expecting one to be honest, I'm happy to be proven wrong though.

Now I'm looking at castrol classic oils.

i see gtx classic and classic xl. two grades availaible. 10/40 & 20/50. I did find the zddp content for gtx 10w40. i think it was 1350 compared to valvo at 1400. I need to go back and confirm that.

interesting how castrol call gtx 10w40 an oil for 1978 on with high zinc but the xl only has 800 to 1000 and is recommended for earlier stuff.

dont over think it .. just use valvolene like the rest of us

What that man just said...

.

Have used it in every aircooled Porsche (& many other classics) I've owned ...


.

I've just ordered 10 litres from Opie as giving the Yellow car a service in the next couple of weeks

The castrol classic xl 20w50 has 800 to 1000ppm zddp levels.

Liqui Moly classic 20w50 has a zinc content of 1300 ppm.

I'm going to try this.

https://www.classic-oil.com/en/products ... 9856913790

This one is German and called Wagner Classic 20w50. They've confirmed the zddp content is 1200. not a bad price either.

Scroll to the bottom of the page to view it in english, if it isn't already.

Dean.s wrote: ↑Wed May 27, 2026 1:54 pm https://www.classic-oil.com/en/products ... 9856913790

This one is German and called Wagner Classic 20w50. They've confirmed the zddp content is 1200. not a bad price either.

Scroll to the bottom of the page to view it in english, if it isn't already.

So basically it is just a normal mineral oil, produced by?? with their own oil additive added to it presumably at the 10% ratio they suggest in their blurb..........so just buy the additive..............which is on the link to the one you posted above?



Universally useable wear protection additive without solids

WAGNER Classic Oil Additive - Wear protection & friction reduction for engine, gearbox, differential

This oil additive is free of solid fertilisers. In contrast to conventional oil additives, it chemically combines with the molecules of metal surfaces and forms a microscopically fine reaction layer (protective shield), which prevents welding on the rubbing metal parts. A continuous and comprehensive smoothing of the surfaces is the result. This smoothing results in exceptional emergency running properties and a significant reduction in wear, which is only surpassed by our Micro Ceramic.

This means

More engine power is added to the drive wheels because less power is converted into heat. For the same reason, the (oil) temperatures in the engine drop.

Fuel consumption with the same power output is significantly reduced.

The exhaust gas values improve significantly.

The engine runs quieter and less vibration

The cold start behaviour of the engine improves.

The service life of the mechanic is significantly increased

Range of application

The WAGNER Classic Oil Additive can be added to any commercially available mineral, semi- and fully synthetic engine and transmission oil and is suitable for turbo and catalytic converters.

Wagner Classic Oil Additive is particularly suitable for engines with white or non-ferrous metal main bearings.

Areas of application:

Petrol, diesel and gas engines

Manual transmissions

Differentials

Industrial machines

Hydraulic systems

Wet clutches in motorcycles, agricultural and construction machinery

WAGNER Classic Oil Additive exceeds the following specifications in connection with base engine oils

API

CF-4/SHPD/SJ

ACEA A 3, B3

Measuring out

Replace 10% of the oil quantity with WAGNER Classic Oil Additive.

Please note: Each engine consumes oil.

Oil consumption supplement: 90% engine oil + 10% additive

Article numbers/ container sizes:

010500 - 500ml

010001 - 1L

That’s me sorted ready for servicing - currently £29.99 for 5 litres from Opie


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