Quote:
Originally Posted by Vtx531
My Bentley manual says they both use hypoid 75W90. What is correct for the two different oils? Owners manual doesn’t really say. “101 projects for your porsche boxster” says original porsche oil or delvac 75w90.
Ill probably stick with what I already put in there for now and see how it goes. And maybe end up changing it to genuine porsche oil as I have read on your previous posts most people end up having to do!
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Porsche likes to use full synthetic gear oils that are manufactured to their specifications, which have no API ratings such as Gl-4 as they have never been tested under API/SAE. The oil in the five speed was produced by a Shell subsidiary called “Burma ”, and is unique apparently due to the type of alloy used for the synchronizer rings used in the transmission. The six speed uses a different lube, but again one made for Porsche. Several years ago, we contacted all the major gear oil manufacturers to see is anyone had something comparable, only to be told that they “might have something that could work, but the gear lubricants Porsche uses are unique and we cannot be sure they will work”. And as the lubes are made exclusively for Porsche, you cannot find them anywhere else, and because the Porsche gear oil market is so small, the big company’s are not going to get into competition with Porsche.