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1996 993 C4S Approved Oils (over and over)

Engine

Vehicle Information: Model: 993 C4S; Year: 1996; Body Type: Coupe; Total Mileage: 93000Km;

Joel, As usual the work you do and information you provide are top notch - thanks for this. I just bought my car this year and have begun to do my own maintenance on it - the car is a 1996 993 C4S. What seems like should be a simple question/response has become quite a dilemma for me. The question is related to the approved oils which should be used in my car. I originally went by the advice of a Porsche dealer and purchased lots of Mobil 1 15W-50. I then read all of the responses in the PCA forums, as well as reviewing TSB 1701. So here's what I have found. Both authorized Porsche dealers in my area use two different grades (all year round) - one sells 15W-50 and the other 5W-50 for the 993 exclusively. Based on the TSB 1701 which is specifically targeting the 996 neither of these are marked for approval. The problem is that the TSB also states that the approved oils list can be used retroactively for any Porsche engine, be it 4, 6 or 8 cylinder from 1973 onward. Furthermore you make it quite clear that a 15W-50 grade would be far too thick except for racing-type setups and a lot of my reading confirms this - it's really a hot-hot-weather oil. What now? Please keep in mind that the weather ranges are similar to the area that you are in as far as snow accumulation may be concerned - summers can range from 85F to 100F and winters can easily range from -5F to -15F. The car will not be driven in the dead of winter, but may see some colder weather use. I have sent this similar information to one of the Porsche dealers I deal with to see what they may have to say - but I'm curious as to whether they really got it wrong in the first place? Thanks for any light you can shed on this. I will pass along any updates that they provide to me as I get it.

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