brian in buddina Posted 6May, 2019 Report Share Posted 6May, 2019 On the final, stages of completing my clutch job, I hope. Before the transaxle goes back in I thought I would replace the transaxle fluid. 1988 944s non limited slip checking the manual it states: 2.0 litres hypoid gear oil SAE80 API class GL4 (mil-L 2105) reading a Rennlist discussion on the topic: they suggest in the US - Redline MT 90 (GL4) about 2.6 litres, full to the underside of the fill hole. going in to my local Auto Barn they suggested from their data base: Penrite pro gear full synthetic 75W85 and it state GL4 I do not know what is in there now and how old it is. What does the brain trust recommend? Quote Link to comment Share on other sites More sharing options...
Buchanan Automotive Posted 7May, 2019 Report Share Posted 7May, 2019 Superseded to 75w-90 GL5 , even in the Porsche ( printed by Porsche ) Technical specifications booklet for the 944S 87-88 , 944S2 89-91 , 944turbo 85-91 , printed Jan 1991 it states } 75w - 90 GL5 OR ( being late 1990 / early 1991 when written / printed ) Porsche knew that 75w-90 was not easy to get in a lot of countries ( 29 / 30 years ago ) , so they still gave you the old choice of SAE 80 GL4 Regards Bruce Buchanan Buchanan Automotive brian in buddina 1 Quote Link to comment Share on other sites More sharing options...
Mike D'Silva Posted 7May, 2019 Report Share Posted 7May, 2019 ^^^ what he said Quote Link to comment Share on other sites More sharing options...
brian in buddina Posted 8May, 2019 Author Report Share Posted 8May, 2019 Thank you Bruce, much appreciated. Both Clarks Garage & the discussion on Rennlist fill to the underside of the fill opening, about 2.6 litres. The original Porsche manual states 2.00 litres. Is the 2.6 litres for loss from leakage? What quantity would you recomend Bruce? Quote Link to comment Share on other sites More sharing options...
Buchanan Automotive Posted 8May, 2019 Report Share Posted 8May, 2019 In the same Porsche printed spec book I mentioned in my last post , Porsche printed the words " Aprox 2 Litres " , so officially that means Approximately , but to me the absolute minimum will be 2 liters brian in buddina 1 Quote Link to comment Share on other sites More sharing options...
brian in buddina Posted 9May, 2019 Author Report Share Posted 9May, 2019 Bruce where would you go to find a copy or download of the "Porsche ( printed by Porsche ) Technical specifications booklet"? Quote Link to comment Share on other sites More sharing options...
Buchanan Automotive Posted 9May, 2019 Report Share Posted 9May, 2019 Part number on rear of the booklet = WKD 423 520 Quote Link to comment Share on other sites More sharing options...
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