Richard Farrant Posted November 8, 2015 Share Posted November 8, 2015 I have been grappling with oil equivalence for OEP 220 specified for bevel boxes, etc. Most internet sites show this equates to EP90 gear oil, which usually shows up as 80W/90 gear oil in internet searches. I am trying to find the correct product to buy in USA and stumbled on an interesting paper on this topic. It is available here:http://www.widman.biz/uploads/Transaxle_oil.pdf Apparently, in USA, almost all 80W/90 gear oil that is sold (Walmart, Pepboys, etc) is a GL-5 spec. This contains too much sulphur additives for yellow metals and it seems like the right oil for the Saracen must be GL-4 spec, which is the EP90 standard. Granville oil has a nice recap of the differences, and their EP90 gear oil specifically shows GL-4: http://www.granvilleoil.com/downloads/Which-Gear-Oil.pdf Problem is, Granville seems to be a UK brand... so I am still searching for an EP90 gear oil -- again SAE 80W/90 oils are all GL-5!! I thought this might be useful to others, there are a lot of cobwebs on this topic! OEP220 was once a SAE 90 grade of gear oil, then it was superseded by 80w/90. It might be easier for you to check the US military oil standards, as it is to MIL-L-2105D. I do not think there would have been any problem with sulphur additives as the earlier spec for OEP220 when it was a SAE90 grade, was that it had no deleterious effect on copper foil at 250 degs F. Quote Link to comment Share on other sites More sharing options...
Starfire Posted November 8, 2015 Share Posted November 8, 2015 Nulon Australia confirmed that their GL-5 EP90 and 80w90 are fine for use in the Saracen. Quote Link to comment Share on other sites More sharing options...
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