i am the kuku who vote for TCM's oil because its free..
Err....by default the freebie EO is mineral oil leh, last 5K tia, U can opt to use full syn oil to prolong your free servicing period.
Fasflo oil ah full syn somemore, I tried, 5K plus only engine starts to make noise and sluggish. Shogun a bit better, 7.5K make noise and sluggish.
Any bros here can tell me full sync oil ah, the color by right is what ah? mine when I check when just service is dark brown color when i pull the EO stick, now after 7.5K when I check again, I can see streaks of blackish brown......
Last time while on mineral oil I check it was yellowish or golden cooking oil color.