Just a comment for any one interested, I have run my S1s on ordinary unleaded (always brand name not safway crap) with 1ml of valvesaver to the litre (about) ever since good petrol was taken from the market, no problems yet.
It is true that they do not get used every day but a 12 hour non stop drive happens every now an than.
Remember the engine was designed to run on very low grade fuel not shell ultra something.
Dennis

