Merv Posted 17July, 2019 Report Share Posted 17July, 2019 As I move towards and other 911 arriving in the near future I am developing a 'to do' list. One of these items is changing transmission oil. So, I have looked at many threads on the "Porsche approved oils" and alternatives for the G50 gearbox. Like most oils research, there are more questions raised than answers. So can I ask the simple questions - (1) what actually do Porsche Australia put into the G50 (in this case an 88 Carrera) and (2) what approved alternatives are there? Quote Link to comment Share on other sites More sharing options...
Dreamr Posted 18July, 2019 Report Share Posted 18July, 2019 9 hours ago, Merv said: As I move towards and other 911 arriving in the near future I am developing a 'to do' list. One of these items is changing transmission oil. So, I have looked at many threads on the "Porsche approved oils" and alternatives for the G50 gearbox. Like most oils research, there are more questions raised than answers. So can I ask the simple questions - (1) what actually do Porsche Australia put into the G50 (in this case an 88 Carrera) and (2) what approved alternatives are there? The guru on this subject would be @Buchanan Automotive Hopefully they can chime in and set you right ... 😀 Quote Link to comment Share on other sites More sharing options...
Buchanan Automotive Posted 18July, 2019 Report Share Posted 18July, 2019 75w-90 GL5 Quote Link to comment Share on other sites More sharing options...
Merv Posted 18July, 2019 Author Report Share Posted 18July, 2019 Any particular one or brand? Synthetic, semi-synthetic, mineral? Quote Link to comment Share on other sites More sharing options...
Peter M Posted 18July, 2019 Report Share Posted 18July, 2019 Merv If you search on Pelican forum “G50 Trans Fluid” there is a neat couple page thread that will answer your question I think. Quote Link to comment Share on other sites More sharing options...
Mike D'Silva Posted 18July, 2019 Report Share Posted 18July, 2019 I have a new, unopened 5 litre bottle of this stuff.. https://www.motul.com/sg/en/products/motylgear-75w90 Was going to try it in my 964 but sold the car. Quote Link to comment Share on other sites More sharing options...
Merv Posted 18July, 2019 Author Report Share Posted 18July, 2019 Thanks Peter and Mike. There are some very expensive oils out there, as always. Royal Purple seems fun! (Not). So the consensus seems be for fully synthetic Mobil 1 LS, Mobilube PTX or the Motul semi-synthetic product. IF one can find them for sale anywhere (5L) and not in amounts that would last you two lifetimes... Some are specified for limited slip differential use and some not. I guess not all G50's need LS but is it a problem to use an LS oil in a non-LS tranny? The Mobil product seems well received. https://forums.pelicanparts.com/porsche-911-technical-forum/1008772-g-50-trans-fluid.html Quote Link to comment Share on other sites More sharing options...
Peter M Posted 18July, 2019 Report Share Posted 18July, 2019 No problem with using LS in a non LSD transaxle. The GL5 and viscosity grade is the only important criteria. I notice you can buy this oil off eBay for $84 for 4 quarts. Or make Mike an offer he can’t refuse! Quote Link to comment Share on other sites More sharing options...
StevepGT3 Posted 19July, 2019 Report Share Posted 19July, 2019 I used the Synthetic Penrite 75w 90 in my 993 and found the shifting far superior than with one of the whizz bang, Rennlist recommended brands that they all swore by. Peter M 1 Quote Link to comment Share on other sites More sharing options...
Merv Posted 20July, 2019 Author Report Share Posted 20July, 2019 Thanks Steve. I will be going with a fully synthetic gear oil as well. Quote Link to comment Share on other sites More sharing options...
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