OTTO Excavator Spare Parts Zx55Ur 4Le2 Oil Filler Cap 5117500020 511750-0020 5-11750002-0 For Isuzu OTTO Excavator Spare Part: Oil Filler Cap for Zx55Ur with Isuzu 4Le2 engine. Part numbers: 5117500020, 511750-0020, 5-11750002-0. Designed to seal the oil fill opening, ensuring proper oil retention and preventing contaminants from entering the engine.