Tested them all recently on new cadet on dyno ended with 6.2 on A 747. A747 is the best,after 6 yrs + of racing the cadets identical brother the Easy kart (with electric start) and the adult Lynx 100,we NEVER had an engine seize except once when we re-fuelled with the genny fuel that was some left over ~~ell M mix that was mixed from a batch of oil was found to have been contaminated from new.
Its not harder to find A747 its just CASTROL won't give it way due to not being a "production line" oil its £19.50 a litre,cases of it in stock at Swindon only goes through 2 distributors,but the secret is in the mix,so 5 litres to ~~mls mix = same cost pro rata as M but a better oil,no carbon build up or sticking rings. ,
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