There are a total of 97 8-letter words containing 'oil', and the number may vary in different dictionaries. You can specify the dictionary and order.

• aerofoil ₁₂
• airfoils ₁₂
• assoiled ₁₀
• boilable ₁₆
• boiloffs ₁₈
• boilover ₁₆
• broilers ₁₂
• broiling ₁₅
• despoils ₁₃
• embroils ₁₅
• entoiled ₁₁
• estoiles ₉
• foilable ₁₆
• foilists ₁₂
• foilsman ₁₆
• foilsmen ₁₆
• garboils ₁₄
• gumboils ₁₈
• jetfoils ₂₁
• milfoils ₁₆
• octofoil ₁₅
• oilbirds ₁₃
• oilcakes ₁₆
• oilcamps ₁₈
• oilcloth ₁₅
• oilfield ₁₄
• oilholes ₁₂
• oiliness ₁₀
• oilpaper ₁₅
• oilproof ₁₅
• oilsands ₁₁
• oilseeds ₁₀
• oilskins ₁₄
• oilstone ₁₀
• oiltight ₁₃
• oilwells ₁₄
• overboil ₁₆
• overtoil ₁₃
• panbroil ₁₆
• parboils ₁₅
• potboils ₁₅
• preboils ₁₅
• reboiled ₁₃
• recoiled ₁₃
• recoiler ₁₂
• reoiling ₁₂
• roiliest ₉
• sexfoils ₁₉
• snakeoil ₁₄
• soilages ₁₁
• soilless ₁₀
• soillike ₁₄
• soilures ₁₀
• spoilage ₁₄
• spoilers ₁₂
• spoilery ₁₄
• spoiling ₁₅
• subsoils ₁₃
• tinfoils ₁₃
• toileted ₁₀
• toiletry ₁₁
• toilette ₉
• toilsome ₁₂
• toilworn ₁₃
• topsoils ₁₂
• trefoils ₁₂
• troilism ₁₂
• troilite ₉
• turmoils ₁₃
• uncoiled ₁₅
• unfoiled ₁₅
• unsoiled ₁₂
• unspoilt ₁₄
• upboiled ₁₇
• upcoiled ₁₇
• parafoil ₁₃
• unboiled ₁₁
• bemoiled ₁₃
• betoiled ₁₁
• boilings ₁₁
• deasoils ₉
• doiltest ₉
• droiling ₁₀
• emboiled ₁₃
• foilings ₁₂
• hexafoil ₂₁
• oileries ₈
• oilfired ₁₂
• oilgases ₉
• smoiling ₁₁
• soiliest ₈
• soilings ₉
• spoilful ₁₃
• toilinet ₈
• toilings ₉
• toilless ₈
• troilist ₈

There are 97 8-letter words containing oil in the well-known word game dictionary, 68 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 89 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 75 in the Words with Friends (WWF) dictionary.