Transmission fill - 11mm below the plug? Why?

[Vtx531]

Originally Posted by JFP in PA

The five speed uses a different oil.

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!

[Vtx531]

I drove the Boxster today and the shifting was good and no issues like the first day after the new gear oil. Hoping I have the same experience as Tommy2

[JFP in PA]

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!

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.

[Vtx531]

Originally Posted by JFP in PA

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.

Thank you - I really appreciate the comments and sharing your knowledge and experience. You probably don’t remember but I bought my Boxster for cheap with an overheating issue about three years ago and you helped me to diagnose and fix the problem. I probably wouldn’t be driving and enjoying it today without your past help