Narrative:

Aircraft picked up at [a maintenance service facility]. Previous write-up detailed oil fumes/smoke in cockpit in flight with crew forced to use oxygen and land. Maintenance resolution detailed changing filters; water separator sock; and no problem detected. Aircraft was released for service.we departed without passengers and began to notice eye discomfort at 7;000 feet. Climbing through 10 or 11;000 feet a definite oil smoke or fumes was detected. Aircraft leveled and ATC notified we would be returning to [departure airport]. As power was reduced the fumes abated and crew went on oxygen for most of the descent and landing.both crew members experienced raspy irritated throats and notified [medical facility] of the incident. [The facility] sent us to an urgent medical clinic for examination after inhalation of toxic fumes.engine oil was obviously entering the air conditioning/pressurization system as evidenced by the decrease in fumes with power reduction.aircraft with smoke/fumes problems should never be released to the line after repair without duplicating the conditions under which the problems occurred. [Company] should have had a test flown [in] this aircraft with high power settings. The toxicity of engine or hydraulic fluid can cause very harmful long term effects on crew and passengers. The previous crew had documented oil fumes/smoke; not 'dirty socks' smell from the water separator; yet maintenance focused on the water separator.subsequently this aircraft is undergoing a right engine change after borescope.

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Original NASA ASRS Text

Title: CE-560XLS Captain reported returning to departure airport after experiencing toxic fumes in the cabin during climb.

Narrative: Aircraft picked up at [a maintenance service facility]. Previous write-up detailed oil fumes/smoke in cockpit in flight with crew forced to use oxygen and land. Maintenance resolution detailed changing filters; water separator sock; and no problem detected. Aircraft was released for service.We departed without passengers and began to notice eye discomfort at 7;000 feet. Climbing through 10 or 11;000 feet a definite oil smoke or fumes was detected. Aircraft leveled and ATC notified we would be returning to [departure airport]. As power was reduced the fumes abated and crew went on oxygen for most of the descent and landing.Both crew members experienced raspy irritated throats and notified [medical facility] of the incident. [The facility] sent us to an urgent medical clinic for examination after inhalation of toxic fumes.Engine oil was obviously entering the air conditioning/pressurization system as evidenced by the decrease in fumes with power reduction.Aircraft with smoke/fumes problems should never be released to the line after repair without duplicating the conditions under which the problems occurred. [Company] should have had a test flown [in] this aircraft with high power settings. The toxicity of engine or hydraulic fluid can cause very harmful long term effects on crew and passengers. The previous crew had documented oil fumes/smoke; not 'dirty socks' smell from the water separator; yet Maintenance focused on the water separator.Subsequently this aircraft is undergoing a right engine change after borescope.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.