sulzerman Posted January 14, 2015 Report Share Posted January 14, 2015 Hi all Having trouble getting hold of ep90 gl4 oil Is 80/90 OK to use in a diff? A guy in halfords said it is fine. Thank you Link to comment Share on other sites More sharing options...
mishmosh Posted January 14, 2015 Report Share Posted January 14, 2015 Ho to a tractor dealers. Or if you are near shrewsbury call me. Link to comment Share on other sites More sharing options...
KevinR Posted January 14, 2015 Report Share Posted January 14, 2015 EP80/90 GL4 is fine to use in a diff. The most important bit is GL4. Some, but not all GL5 spec oils will damage the diff. The oil suppliers are not always very open about the formulation of their oil, so it can be difficult to establish if any particular GL5 spec oil is "yellow metal" safe. It's easier to just avoid GL5 spec oils - just in case the one you happen to use is not yellow metal safe. By the way, you can use a GL5 spec oil to oil your trunions - the problem ingredient only becomes a problem when the oil is hot and under a lot of shear pressure, which is only found in the diff. Link to comment Share on other sites More sharing options...
Darren Groves Posted January 14, 2015 Report Share Posted January 14, 2015 Hi all Having trouble getting hold of ep90 gl4 oil Is 80/90 OK to use in a diff? A guy in halfords said it is fine. Thank you Just do a search for EP90 GL4 on Ebay, loads of it on there. http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xep90+GL4&_nkw=ep90+GL4&_sacat=0 Link to comment Share on other sites More sharing options...
KevinR Posted January 14, 2015 Report Share Posted January 14, 2015 You can also buy GL4 EP90 from the Club Shop - https://shop.tssc.org.uk/product/castrolhypoy-ep90-gear-oil-1-litre Link to comment Share on other sites More sharing options...
Steve C Posted January 15, 2015 Report Share Posted January 15, 2015 If Halfords have been recommending this one to you, I have been using it for years without problems: http://www.halfords.com/motoring/engine-oils-fluids/gearbox-oil/halfords-gear-oil-ep-80w-90-gl-4-1l Proper EP90 GL4 is also available from Canley Classics. As Kevin says, GL5 is only an issue when in the challenging environment of a diff or gearbox, when it comes under extreme pressure and gets flipping hot. Some formulations apparently attack phosphor-bronze and other "yellow metal" components found in these assemblies under those conditions. On a point of information, where engine oil is concerned I read somewhere that Halfords Classic 20w50 is an identical formulation to the original Castrol GTX, but I am sure someone out there will correct me if this is wrong. For myself, I have tended to steer clear of synthetic engine oils, although I know John Kipping swore by Mobil 1! Regards Steve C Link to comment Share on other sites More sharing options...
juppy Posted January 15, 2015 Report Share Posted January 15, 2015 Halfords classic 20/50 is actually made by Comma, as i found out when talking to Comma with a veiw to stocking there oils in the club shop. Link to comment Share on other sites More sharing options...
mishmosh Posted January 15, 2015 Report Share Posted January 15, 2015 Morris oils 20/50 is tops. Link to comment Share on other sites More sharing options...
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