I ran across this little item on a website. It's not the first time I've heard it said, and I am in no way trying to harm the website that this was copied from.
Quote:
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All Porsche transmissions use a very steep hypoid angle in the differential due to the necessity of close shaft spacing. This is a very highly stressed item and requires the use of a GL-5 Specification gear Lube. Since these gearboxes all use the Porsche-design balk ring syncromesh, they depend upon some friction for these brake-band type syncro's to work properly. The best gear lube for a 901-915-930 transmission is the superb Swepco 201 gear oil. Using a synthetic gear oil in these transmissions will result in higher syncro wear and stiffer shift quality.
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Anyway, here is my complaint.
I know Swepco is every Porsche mechanics "magic" curative, but I really believe that is just a function of "primacy learning". I don't see any mechanical reason that a properly rated synthetic should not be used.
And there are several synthetics that are GL-5 rated.
So... I would like to hear from people who really KNOW and have real experience (not people who have just heard a story from a friend). Especially if somebody like Lubemaster could chime in - or some other person who works in the lubricants industry.
I'm about to start a rebuild on my 915 in a week or so, and barring any real proof that I should not do so, I will be using a synthetic product such as
this.
Thanks.