Rover Metro gear box oil

Hi all, I've just built a kit car using a Rover Metro Kseries 8 valve engine and need to replace the gearbox oil as it is empty. The Haynes manual states that a special oil is required from a Rover dealer but that it can be topped up with ordinery Duckhams 75-80. Does anyone know if thie special Rover oil is actually critical and if any 75-80 can be used?

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daffyydW
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