I use Castrol Activ 2T, bought 2 x 4 litres when it was on special at Repco before Christmas 2014. it was $31.99 for 4 litres then. Not precious about the brand though, if there is a cheaper mineral 2t for air cooled engines which costs less when I next need to buy some, I'll get that. Have always run it at 200:1 but might try 300:1 to see if it makes any difference.





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