I switched from regular air tool oil to Fuch Silkair. It's not expensive and the tool do spin up better using it.
https://www.ebay.co.uk/itm/1x-Silka...019047&hash=item522c19402a:g:yOAAAOSwXiVeF6aN
https://www.ebay.co.uk/itm/1x-Silka...019047&hash=item522c19402a:g:yOAAAOSwXiVeF6aN