Oil of greater magic weapon +4
(Player's Handbook v.3.5, page 251)
Price (Item Level): 2,400 gp (7th)
Body Slot: —
Caster Level: 16th
Aura: Strong; (DC 23) transmutation
Activation: Standard (applied)
Weight: —
A strange oil, with a sheen to it.
Grants the weapon it is applied to a +4 enhancement bonus, temporarily.
Prerequisites: Brew Potion, Greater Magic Weapon.
Cost to Create: 1,000 gp (plus 400 gp for base item), 80 XP, 2 days.