I originally bought the £15 a litre vauxhall oil which the EPC recommends, but it made the gearbox whine
so went back and bought the cheaper 93165290 vauxhall oil which is much better
you probably wouldn't realise the expensive stuff is s**te in an astra/corsa/vectra, but as the gearbox is just behind my ear in the vx220 its very obvious the oil was too thin