DDK - Die Deutschen Klassiker

SierraMadre wrote:This 20W-50 Porsche Classic Motor Oil is specially adapted to the early air-cooled models for all 356, 914 and 911 models with a displacement of up to 2.7 liters. This mineral oil is available in 1 or 5-liter cans.

For all 356, 914 and 911 models up to the 2.7-liter G-Model, Porsche recommends the multi-grade version with a viscosity of 20W-50. Back in the 1950s, 1960s and 1970s, engines were built with much more generous tolerances than today, which is why the viscosity of an oil must be low enough for it to penetrate into all areas of the engine as quickly and uniformly as possible during cold starts. At the same time, however, its viscosity must not be so low that a stable lubricating film is no longer present when the engine heats up. The developers went to particular lengths to achieve excellent cold start properties for the oil, so that the engine can be lubricated as quickly as possible when started. The CCS test was especially important in this respect, since it simulates the behavior of the oil in the crankshaft bearing during cold starts and at low temperatures.

The Porsche Classic 20W-50 is a mineral oil known as a hydrocracked base oil with mildly alloyed additives. Hydrocracked base oils are characterized by a very low level of contaminants, a very low sulphur content and very good oxidation and aging stability, which prevents deposits, for example. At the same time, the Porsche Classic Motor Oil 20W-50 has an extremely high HTHS viscosity (High Temperature, High Shear), which describes the quality of the engine oil at high temperatures (150 °C) in the lubricating gap and with high shear rate (engine speeds). Finally, the excellent shear stability ensures that the optimum lubricating properties are reliably retained at high engine temperatures, even after long periods of operation and under high loads.

In a nutshell: low levels of deposits (at both hot and cold temperatures), optimum care for classic engines and excellent compatibility with the special materials found in these engines such as cork seals or leaded bearing shells.

mycar wrote:

SierraMadre wrote:This 20W-50 Porsche Classic Motor Oil is specially adapted to the early air-cooled models for all 356, 914 and 911 models with a displacement of up to 2.7 liters. This mineral oil is available in 1 or 5-liter cans.

For all 356, 914 and 911 models up to the 2.7-liter G-Model, Porsche recommends the multi-grade version with a viscosity of 20W-50. Back in the 1950s, 1960s and 1970s, engines were built with much more generous tolerances than today, which is why the viscosity of an oil must be low enough for it to penetrate into all areas of the engine as quickly and uniformly as possible during cold starts. At the same time, however, its viscosity must not be so low that a stable lubricating film is no longer present when the engine heats up. The developers went to particular lengths to achieve excellent cold start properties for the oil, so that the engine can be lubricated as quickly as possible when started. The CCS test was especially important in this respect, since it simulates the behavior of the oil in the crankshaft bearing during cold starts and at low temperatures.

The Porsche Classic 20W-50 is a mineral oil known as a hydrocracked base oil with mildly alloyed additives. Hydrocracked base oils are characterized by a very low level of contaminants, a very low sulphur content and very good oxidation and aging stability, which prevents deposits, for example. At the same time, the Porsche Classic Motor Oil 20W-50 has an extremely high HTHS viscosity (High Temperature, High Shear), which describes the quality of the engine oil at high temperatures (150 °C) in the lubricating gap and with high shear rate (engine speeds). Finally, the excellent shear stability ensures that the optimum lubricating properties are reliably retained at high engine temperatures, even after long periods of operation and under high loads.

In a nutshell: low levels of deposits (at both hot and cold temperatures), optimum care for classic engines and excellent compatibility with the special materials found in these engines such as cork seals or leaded bearing shells.

mycar wrote:The ignition temperature is a deciding factor when choosing motor oil ?

mycar wrote:I think Neil was referring to the ignition temperature/flashpoint of the engine oil itself.

I was wondering how important that would be when deciding which oil to use.

mycar wrote:You're probably right to be wary of this product.... but I wonder, what if a company, one of the most successful engineering companies in the history of mankind, (the same company that designed and built your engine) produced a oil that was specifically designed to be used in that engine ?

What if this oil had been 'subjected to extensive laboratory and road tests to prove its running and lubricating characteristics'.

What if this magical substance was freely available ?

Why would you question its suitability ?

Don't get me wrong, I don't have shares in Porsche oil but there's an awful lot of guff spoken about oil on the internet.

If in doubt, why wouldn't you be happy to take Porsche's word for it ?

neilbardsley wrote:

mycar wrote:

SierraMadre wrote:This 20W-50 Porsche Classic Motor Oil is specially adapted to the early air-cooled models for all 356, 914 and 911 models with a displacement of up to 2.7 liters. This mineral oil is available in 1 or 5-liter cans.

For all 356, 914 and 911 models up to the 2.7-liter G-Model, Porsche recommends the multi-grade version with a viscosity of 20W-50. Back in the 1950s, 1960s and 1970s, engines were built with much more generous tolerances than today, which is why the viscosity of an oil must be low enough for it to penetrate into all areas of the engine as quickly and uniformly as possible during cold starts. At the same time, however, its viscosity must not be so low that a stable lubricating film is no longer present when the engine heats up. The developers went to particular lengths to achieve excellent cold start properties for the oil, so that the engine can be lubricated as quickly as possible when started. The CCS test was especially important in this respect, since it simulates the behavior of the oil in the crankshaft bearing during cold starts and at low temperatures.

The Porsche Classic 20W-50 is a mineral oil known as a hydrocracked base oil with mildly alloyed additives. Hydrocracked base oils are characterized by a very low level of contaminants, a very low sulphur content and very good oxidation and aging stability, which prevents deposits, for example. At the same time, the Porsche Classic Motor Oil 20W-50 has an extremely high HTHS viscosity (High Temperature, High Shear), which describes the quality of the engine oil at high temperatures (150 °C) in the lubricating gap and with high shear rate (engine speeds). Finally, the excellent shear stability ensures that the optimum lubricating properties are reliably retained at high engine temperatures, even after long periods of operation and under high loads.

In a nutshell: low levels of deposits (at both hot and cold temperatures), optimum care for classic engines and excellent compatibility with the special materials found in these engines such as cork seals or leaded bearing shells.

There is a real lack of technical data on that oil. What is the Viscosity Index, zddp content, flash point etc! That would put me off using it.

neilbardsley wrote: However, almost all the oils we have mentioned will do the job well if changed regularly.