Not sure, but can castrol tts be used as a premix or only with the oil pump? can anyone answer? maybe a stupid question but need to know as the 21 has a tank and the 18 which i havent used yet needs premix? like to use same oil for both!!!!

tts can be run pre mix. i used to run it in my moto x bike. it should say so on the back of it with all the other details
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94 mc28 SE