Guild Wars 2

when i use Master Maintenance Oil bonus to power (+ 6% for thougness/+4% for vitality but i dont get any bonus power.

when use Artisan Maintenance Oil i dont get any bonus precision and my critical chance is lower have 45% and when use i got 40%)

If you use Artisan right after Master oil – it is understandable that you’ll get lower crit chance because ALL maintenance oils increase precision. Oil bonus to power is just a typo in tooltip, should be precision.

i use +20% boon +40%mf while under boon and use Oil and its lower my critical chance