In the equipment section Flask (Pint?) of Oil is omitted from the Adventuring Gear table as well as from Ranged Weapons table. However, Lantern is listed in the Adventuring Gear section and Lantern's entry in the Vision and Light section (page 262, PHB, 4th Ed.) specifically lists Lantern as lasting 8 hours/pint of oil.
I have contacted customer support regarding this and here is the reply:
Hopefully this is remedied soonish.
I have contacted customer support regarding this and here is the reply:
WOTC Customer Support said:"There are no rules for Flasks of oil, either as items to purchase or as grenade like weapons.
Thanks for the great feedback! We’ve passed this along to the good folks that make the games and hopefully we’ll see some errata covering this situation soon. Until then, it is up to your Dungeon Master to determine how he/she wants to handle this particular situation in their campaign."
Hopefully this is remedied soonish.