Sir, ang fully synthetic po ng Top1 with a vis grade 5w-40 is the Top1 Evolution. Yung SDO 15w-40 ay tinawag lang na synthetic because of the additives contents nito, Kung gagamit ako nito (akin lang ha), ang OCI ko will be every 5000 km. I use the Top1 HD plus Common rail Diesel with a grade of 10w-30. It's semi-synthetic.



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