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This link should tell you what you need viewtopic.php?f=4&t=2464&p=13587&hilit= ... hel#p13587
A Monograde 140 is recommended BUT NOT an 'EP' one as they have additives that attack the phospher bronze over time. Castrol 140 D is the one I use. Appx £10 per litre and available on eBay.