20W-50 and 10W-60 motor oils now available for all air-cooled Porsche models
Atlanta. Porsche Cars North America, Inc. is launching its own engine oil for air-cooled flat-four and flat-six Porsche engines: Porsche Classic Motor Oil. In collaboration with the Porsche Development Center in Weissach, Germany, the new engine oil has been developed by the Porsche Classic experts to meet the lubrication requirements of all Porsche air-cooled engines. The sports car manufacturer made the transition to liquid-cooled engines in the 911 model line in 1998.
Porsche Classic Motor Oil comes in two different versions:
Porsche Classic Motor Oil offers the following benefits:
Just in time for the start of the season, Porsche Classic is launching its own engine oil for air-cooled flat-four and flat-six engines: the Porsche Classic Motoroil. And if it says Porsche on the label, then you can be sure that there is Porsche inside. In collaboration with the Porsche Development Centre in Weissach, the new engine oil has been developed by the Porsche Classic experts with the specific aim of meeting the demands of the 356 and 911 models, including the 993 model range. Its operating behaviour and lubricating properties were put to the test in extensive laboratory-based tests and practical trials. The Porsche Classic Motoroil comes in two different versions: 20W-50 for all 356, 914 and 911 models up to the 2.7-litre G-Model and 10W-60 for flat-six engines from a displacement of 3.0 litres up to the 911 (type 993).
The engine is the heart of each and every Porsche, and air-cooled flat engines place particular demands on a lubricant. The thermal load is higher than in water-cooled units, for example, which means that the engine oil has to work harder to cool the engine down. The larger oil volume firstly entails a longer oil heating time, and secondly calls for optimum cold running behaviour. The traditionally high power output per litre of the engines also results in high compression and high pressures. Together with the different temperature zones which are characteristic of air-cooled engines, this means that the oil needs a high “hidden” performance reserve.
A compact and lightweight engine design means that the connecting rods will be short in relation to the piston stroke, which in turn means high lateral piston forces and correspondingly high demands on the lubricating film stability of the oil. In short, the older flat engines in particular can’t just use any old oil. The development of an engine oil for classic air-cooled flat engines has therefore been something akin to a balancing act between tradition and innovation: as advanced as possible and as traditional as necessary.
Although modern oils are better from a technical point of view, this is not the case when it comes to classic air-cooled flat engines. For example, the low viscosity of a 0W-30 oil means optimum cold-start behaviour, low engine resistance and other benefits in modern engines. In a 356, however, an oil of this kind can result in leaks and increased oil consumption due to the engine’s higher production tolerances and lower oil pressure during operation.
Modern oils also use highly efficient detergent/dispersant agents to thoroughly clean the engine and reliably remove dirt, which can be too much of a good thing for a classic Porsche engine. It is true that additional deposits should be prevented and oil-soluble contaminants such as soot, water and dust kept suspended until they are drained off through the oil filter or removed during the next oil change, but at the same time it is important that the deposits which have built up over decades are not suddenly dissolved and that seals are not corroded.
Since not every classic Porsche is in everyday use, the engine oil also had to meet other demands: classic vehicles are often left stationary for long periods of time and only moved intermittently and for short journeys, which means that condensation can form in the oil if the engine does not heat up fully. Aggressive combustion residues can cause acidification of the oil fill, resulting in the corrosion of engine components. The alloys, metals and sealing materials which were used at the time are at particular risk. Porsche therefore paid particular attention to this aspect when developing its Porsche Classic Motoroil. The special formulation incorporates a high alkaline reserve, which neutralises any acids that may form. Additional corrosion inhibitors also protect vulnerable components, even during longer stationary periods.
20W-50 for the 356, 914 and early 911 models
For all 356, 914 and 911 models up to the 2.7-litre 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 behaviour 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 characterised by a very low level of contaminants, a very low sulphur content and very good oxidation and ageing stability, which prevents deposits, for example. At the same time, the Porsche Classic Motoroil 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.
20W-50, 1 litre: Part no.: 00004320928
Don’t forget the following accessories:
10W-60 for the 911 from a displacement of 3.0 litres
Starting from the 3.0-litre engine with dry-sump lubrication, the flat-six engines of the 911 are more suited to fully synthetic oils. They allow air-cooled engines to reap all the benefits of technological advances in oils. Porsche Classic’s 10W-60 version is an absolute ultra-high-performance oil. Its viscosity guarantees optimum lubrication behaviour, both during cold starts and in a hot engine at full throttle. The fully synthetic PAO-based (polyalphaolefin) oil also has excellent properties in terms of evaporation loss, HTHS and shear stability. Anyone venturing onto a race track in a 911 would also be well advised to use the 10W-60 oil, since it cares for and cleans the engine. For example, the additives ensure that the flow of oil reliably transports particles and contaminants to the oil filter.
The oil change intervals for individual vehicle and engine types can be found in the relevant driver’s manuals. Engine oil should be changed once a year regardless of distance travelled, since short trips can have a particularly adverse impact on oil. Frequent cold starts mean that increased quantities of fuel, combustion products and moisture enter the oil. This is compounded by the fact that the engine never heats up properly and hence the by-products cannot evaporate. Your first port of call for an oil change should be a Porsche Centre. This is where customers can purchase the Porsche Classic Motoroil in one or five-litre containers. It’s worth mentioning in passing that the container itself is a real eye-catcher, designed by the Porsche designers in the Development Centre in Weissach.
Matching oil filters are of course also available from every Porsche Partner in addition to the Porsche Classic Motoroil.
And if you’re going to be using original Porsche oil in your original Porsche, you’re going to need an oil change label in the engine compartment. Porsche Classic has designed one to match.
10W-60, 1 litre: Part no.: 00004320930
Don’t forget the following accessories: