This topic has been raised a couple of times - try the search function to find all the responses. Several people are using Silkolene Comp2 fully synthetic, I use Morris Road and Race +2 semi synthetic, and a long term Silk owner uses mineral oil without problems. Pay your money and take your pick as they say!
Thanks Paul,
The reason for asking is i have been given around 25 litres of mineral but I've been using synthetic for a while so question really is to buy more synthetic or use the mineral, thanks for your comments