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Saracen / RR B80 Fluids


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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OEP220 was once a SAE 90 grade of gear oil, then it was superseded by 80w/90.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.

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