Big B i200 Posted June 21, 2015 Share Posted June 21, 2015 Hello all, I am about to change the oil in my ZF LSD, bought the EP90 and the required GM additive, however, there is no guidance on how much additive to add. It's a 50ml bottle so do I add the lot or do I need more ? Any comments appreciated. Quote Link to comment Share on other sites More sharing options...
rutts Posted June 21, 2015 Share Posted June 21, 2015 If its a zf buy the castrol lsd oil cheap enough from most motor factors. Quote Link to comment Share on other sites More sharing options...
Big B i200 Posted June 22, 2015 Author Share Posted June 22, 2015 Cheers Rutts but I am struggling with this, I went to my local Factors and asked for LSD oil, he kind of looked at me blankly as he wasnt sure which one to offer 70/90 or something........do you have a name or spec ? I previously asked on FB about this, I was going to use Castrol Syntrax, but got guidance that it was too aggressive for old diffs, seals etc, due to the modern additives and someone said use additive 90004033, then someone added in that EP90 with the additive is what to use, so I went with that, then someone said EP90 is not suitable, so I am back to square one. I currently have EP90, 50ml of 90004033 a diff gasket and a fear that if I do this it will not be right. Is this the sort of thing I need :- Castrol Axle Z Limited Slip 90 (was Hypoy LS90) Quote Link to comment Share on other sites More sharing options...
rutts Posted June 22, 2015 Share Posted June 22, 2015 Castrol b373 oil is right stuff. 9 on ebay per litre. used it in mine Quote Link to comment Share on other sites More sharing options...
Big B i200 Posted June 22, 2015 Author Share Posted June 22, 2015 Is it OK ? Says on brief not suitable for road use. Quote Link to comment Share on other sites More sharing options...
611 Posted June 23, 2015 Share Posted June 23, 2015 You should be able to get the proper GM stuff from Andy C on here. Got mine from him and the bottle of additive for my limited slip. He should also know what to use as not got to the stage of adding mine yet :-) Andy Quote Link to comment Share on other sites More sharing options...
Big B i200 Posted June 23, 2015 Author Share Posted June 23, 2015 Cheers 911 and Rutts, thanks for the comments, I just bought 2 litres of Castrol LS90 as it says its spec'd for ZF LSDs and I have the GM additive so all should be good, its getting a new diff gasket as well and engine oil(Mobil 2000 10w40 semi synth) and filter, and all new brake fluid, should really do the gearbox too but I think that will do for now. Quote Link to comment Share on other sites More sharing options...
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