D&D 5E How does Oil(flask) function in the 2014/2024 rulebooks?

[Paprika]

If the target takes any fire damage before the oil dries (after 1 minute), the target takes an additional 5 fire damage from the burning oil.

The question is here, my friend told me “in RAW oil can produce 5 fire damage EVERYTIME your fire damage dealt,” but I think the sentence “If ... takes any fire damage, ... takes an...” is about “ONCE in the duration.”
I've seen 2024's words, and it's absolutely the same as the 2014's words.
So... Who is correct? Everytime+5? Or Once+5? Or Neither?

BTW, +5 every time is IMBA in my opinion. The flask of oil is an mundane object that costs only 1sp. And both the Hex spell and the Hunter's Mark spell use the word “whenever” to figured “them function every time”, but the flask of oil isn't using that word.

 

[mamba]

Once, after the first time the oil has been used up, also

And both the Hex spell and the Hunter's Mark spell use the word “whenever” to figured “them function every time”, but the flask of oil isn't using that word

 

[pukunui]

Once, after the first time the oil has been used up

Yeah, I mean, a flask of oil only costs a silver piece, so it should really be a one-off thing. It’s not napalm.

 

[Nikosandros]

Yeah, I mean, a flask of oil only costs a silver piece, so it should really be a one-off thing. It’s not napalm.

I love the smell of lantern oil in the morning.

 

[aco175]

@Paprika welcome to the boards. I rule that target takes extra 5 fire damage only once. A fireball deals damage once and you somehow do not catch fire. The oil drying in one minute seems like it is more intended to be something that flashes and is out.

I do allow someone with a torch to light the oil with advantage to the attack since they are just trying to touch them and not trying to damage them in combat with the torch.

 

[Paprika]

@Paprika welcome to the boards. I rule that target takes extra 5 fire damage only once. A fireball deals damage once and you somehow do not catch fire. The oil drying in one minute seems like it is more intended to be something that flashes and is out.

I do allow someone with a torch to light the oil with advantage to the attack since they are just trying to touch them and not trying to damage them in combat with the torch.

Thanks for the welcome... Yeah, I have the same opinion as yours. That duration only functions as same as Poison's duration, not the duration for figuring out a repeatable effect.

 

[Mouthal]

“Target takes an additional 5 damage from burning oil”, need to apply more oil to get this affect twice “If lit, the oil burns for 2 rounds and deals 5 fire damage to any creature that enters the area or ends its turn in the area. A creature can take this damage only once per turn.” the area affected always occupies the space of the creature covered in oil. It always ends it’s turn in that space and takes 5 fire damage at the end of its turn for 2 rounds. It can however grapple you or if its small occupy the same space as you and cause you to also take 5 fire damage.
ie 3 rogue thief 1 efreetie genie warlock.
Bonus action use an item to make ranged weapon attack, miss, nothing happens, hit: Takes 1d4+dex mod for improvised weapon attack covered in oil. Action: attack with shortbow assume no sneak attack, hit: deal 1d6 piercing plus PB in fire damage from efreeti genie plus 5 damage from oil. If rogue moved first creature takes 5 damage at end of turn this round and next. If rogue moved after affected creature they take 5 damage once at the end of next turn.