ガス油 is read as がすゆ (gasuyu) and means gas oil.
がすゆ
gasuyu
げんゆ
crude oil
せきゆ
kerosene
あぶら
oil
とうゆ
じゅうゆ
heavy oil
けいゆ
light oil
きゅうゆ
refueling (a car, plane, etc.)
しょくぶつゆ
vegetable oil
さどうゆ
hydraulic oil
ごうせいせきゆ
synthetic petroleum
ちゅうゆ
middle oil (oil fraction extracted at intermediate temperatures)
こめあぶら
rice-bran oil