i wonder what make u think that syntium is below average....

I used syntium, penzoil, eneos, shell, mobil before....

all is also around 5/10 w40

the best is mobil, follow by syntium, shell, pennzoil and eneos. (all also semi oil only)

mobil keep my engine very smooth and quiet.

syntium keep my engine able to run in high rpm and less noise too.

shell smooth, less noise but cause my FC become high

pennzoil a bit noisy (maybe coz by the cleaning formula to remove engine carbon?), but good pickup

eneos is the worst for me ... run 3k km tat time is very nice. after 4k km, engine become very very loud sound and FC high.

thus, I truly doubt on your commend unless you try to compare it with others engine oil.

if you feel that syntium is not good. I would suggest you use M7, Q8, liqui moly, HKS, ELF, amsoil (with high grade). that might be able to satisfy you