Engine - Oils Approved by Porsche
Boxster1/99
1701
Binder - 1 Part 2
3-17-00
Engine Oils Approved by Porsche
Vehicle Type:
Boxster/Boxster S
Model Year:
Boxster as of 1997 (V), Boxster S as of 2000 (Y)
Concern:
Engine oils approved by Porsche
Information:
The engine oils listed in this Technical Information are approved for the Boxster. They can also be used for all 4, 6, and 8 cylinder Porsche engines from model year 1973 onwards.
Explanations:
Oil quality and non-conventional basic oils:
The basic oil and the additives added to it essentially determine the properties of an engine oil. Non-conventional basic oils (synthetic or hydrocrack) have more favorable properties as compared to conventional oils (mineral oil). Non conventional oils are relatively similar with respect to performance, regardless of whether they were produced using the synthetic or hydrocrack process.
In our approved oil list (Type column), the engine oils are identified as follows:
cp = basic oil produced conventionally - "conventional processing" (mineral oil).
ncp= basic oil not produced conventionally - "non-conventional processing" (synthetic or hydrocrack).
Non-seasonal "GL" light running oils:
GL oils have good light running properties because of their light low-Temperature viscosity as well as a high level of temperature stability. They have a particularly low tendency to evaporate at high temperatures due to their composition. The oils that meet such high performance requirements, essentially synthetic or hydrocrack oils, can be used without restriction as non-seasonal oils (see approval list, "Type" column).
Non-seasonal "G" oils:
"G" oils can be used as non-seasonal oil, but do not have the same light running properties as "GL" oils.
Viscosity and temperature ranges:
The viscosity of an oil depends on its viscosity rating, as identified by its SAE class (and respective temperature range). Non-conventional oils have superior viscosity properties and very large temperature ranges (see also 'non-seasonal light running oils' point).
Some multi-grade oils with low viscosity ratings are only suitable for operation at constant very low external temperatures, and as a result have a very limited use. These oils are only approved for special instances of application (see drawing below Temperature Ranges' - Identification *)
* Multi-grade oils for arctic climate and extreme low temperatures limited use only.
Approved US Oils:
Miscibility:
The engine oils approved by Porsche can be mixed to the extent that it is not necessary to flush the engine when the oil is changed, or another type of oil is used. This holds true for mineral oils and synthetic oils.
However, since every brand of oil has a specially adapted and unique composition, the same oil should be used for any topping up that might become necessary between oil change intervals, whenever possible.
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