25%油 vs 30%油

Any substantial different in performance for 25%油 and 30%油?
Will 30%油 more easy to damage the engine?
C-hings, please share your experience?
Many thanks!

30%油 is more punch but easy to damage the engine

25%油 操車用
30%油 比賽用

Just a crazy question below:
Could I mix the 25% and 30%油 (become a 27.5%油 ) to use provided that they come from same brandname?
Thanks!

Oh...very crazy...        maybe this is a good idea~

Thanks! Sirio c-hings.

15 - 20% are more than enough for general use. 25% is typically for racing compitiation

If under the same brand, 30% give you more torque less run time.
30% also easier to tune.
30% more expensive!
30% you need to add more head shim and use higher number plug "Cooler plug."