This is a Castor & Synthetic mix.
Best oil for new motors or breaking in a new head or piston ring. The Castor oil will help seat your ring a lot better than only synthetic ester.

Once motor has been broken in after about 4-5 tanks of fuel then swopping over to full synthetic ester (Castrol Power1 - Castrol2T)  will give you a good performing motor with a longer life span.

Our recommended mix ration is 50ml oil to 1 litre of fuel
Our recommended fuel to use is 93 Octane