[Gelbster]

One such oil-spec meddling fool was me.
In cahoots with a very smart German expert on the Forum , I was convinced we could find a better/cheaper oil for the 6 speed . Impressed by our geekish knowledge of the most obscure aspects of tribology we conducted an Internet research project of epic proportions.
Result - zero.
The Porsche spec was the best and in view of the probable repercussions,using substitutes like I almost did - may have been very expensive.
You will always find snake oil anecdotes about 'superior' substitutes. But 2 of us learned to hang back and let other fools go first,second,.......
And I hate paying the Porsche tax - except when it is worth it.
And yes, cough , I am rebuilding a 6 speed now .
The 5 speed and Tip may be more forgiving?