Oil pump/suction tool
The usual manual way
Effective:
Fast, strong, even thanks to the hand pull piston
Accuracy:
Has clear volume scale
Safety:
Tightly sealed, no oil leakage
Effective:
Weak, time consuming, easily interrupted
Accuracy:
Uncontrolled oil production
Safety:
Easy to leak, risk of slipping due to oil spill
Cleanliness:
Easy to spill oil, dirty hands, cause unpleasant odor
Cleanliness:
No oil, no stains