Rasta, its a common mistake but please don't confuse Porsche "approved oils" list produced every few years with the factory oil recomendations in the manual. Porsche (and other manufacturers) produce those "approved" lists occasionally when they come to agreement with oil manufacturers for oils they use in their shops. They are NOT what was recommended for our engines. Again...search if you think I'm bs'ing you.
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...the purpose of Porsche's oil certification program is to tell the dealer network what they are approved to use in servicing cars. This is based on the deals Porsche has made with the oil producers. It isn't intended to inform customers what they should be using.
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And it's not an 80's thing either, you can use any modern oil, synthetic or not, doesn't matter. What matters is you use the correct viscosity range for the climate you are running in and with the correct zddp level built-in for when the car was produced.
LiquiMoly is a great oil btw.