TINGY Posted 23August, 2016 Report Share Posted 23August, 2016 What oil have you people used and or recommend for the 89 turbo 944 gearbox with limited slip diff.Also is the oil cooler required to be removed and emptied as well, any help appreciated. Quote Link to comment Share on other sites More sharing options...
chris_f Posted 23August, 2016 Report Share Posted 23August, 2016 I decided to switch to redline MT-90 on my car, (no LSD on my car though)... I'll let you know how that goes... a lot of of the 944 guys in the states swear by it and say it also works perfectly on cars with an LSD.An important decision... hopefully someone else with more experience can make a suggestion Quote Link to comment Share on other sites More sharing options...
Buchanan Automotive Posted 23August, 2016 Report Share Posted 23August, 2016 The Redline MT-90 gear oil is not recommended for manual transmissions with Hypoid Gears & the 944 / 944 Turbo / 968 / 911 (915) / 911 (G50 ) , 928 ( all ) etc etc all have Hypoid GearsRedline states on their product sheet for the MT-90 } " Not suitable for Hypoid Gears "The other issue is its( MT-90) a GL4 trans oil & the Porsche recommends for the above Porsche cars mentioned a GL5 transmission oil ( higher shear strength )About 4 / 5 years ago ( here in Sydney ) another Porsche specialist informed us of Hypoid ( diff gears ) failures when using this oil on 911 915 transmissions ( very expensive ) , luckily for them its was the owners who installed this oil in their own Porsche's Brands alone are not a real issue , the issue is it MUST be GL5 and its a 75w-90I must admit we do get a lot of extra work from humans using the wrong oils in their last century Porsche's , be it engine or transmission & its completely avoidable ANF and StevepGT3 2 Quote Link to comment Share on other sites More sharing options...
TINGY Posted 23August, 2016 Author Report Share Posted 23August, 2016 Thank Buchanan's, I was kinda hoping you would chime in. Quote Link to comment Share on other sites More sharing options...
Wardy Posted 30April, 2021 Report Share Posted 30April, 2021 (edited) I know this is an old thread but doesn't GL5 oil oil have more sulphur/phosphorus additives which are detrimental to copper and bronze components? Edited 30April, 2021 by Wardy Grammatical error Quote Link to comment Share on other sites More sharing options...
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