A B757-200 IN CLB AT 17000 FT DIVERTED DUE TO FUMES FROM THE L AIR CONDITIONING PACK CAUSED BY RESIDUAL OIL IN NEWLY REPLACED L ENG.

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DURING TKOF; NOTICED ODOR IN COCKPIT WHICH SEEMED TO DISSIPATE AT THRUST REDUCTION WITH FIRST FLAP RETRACTION. COPLT RPTED HE COULD STILL DETECT ODOR. DURING CLBOUT OVER INTERPHONE QUESTIONED FLT ATTENDANTS. THEY RPTED THAT THE ODOR WAS NOTICED; BUT SEEMED TO BE DISSIPATING. 1 FLT ATTENDANT RPTED THAT A PLASTIC CUP HAD MELTED AGAINST A HOT PLATE IN THE MID GALLEY. FLT ATTENDANT THAT WORKED MID CABIN GALLEY RPTED TO ME THAT THERE WAS NO BURNING OR MELTING PLASTIC IN THE MID GALLEY; THAT PREVIOUS RPT OF MELTING PLASTIC WAS IN ERROR. DURING THE TROUBLESHOOTING PROC AND IN RADIO CONTACT WITH MAINT; WE TURNED OFF THE L PACK AND THE TRIM AIR SWITCH. THE ODOR IN THE CABIN SEEMED TO DISSIPATE. THE COPLT RPTED THAT HE STILL DETECTED SOME ODOR. L PACK WAS TURNED ON AND AN IMMEDIATE INCREASE IN ODOR WAS NOTED. L PACK TURNED OFF AND DECISION TO RETURN TO AND OVERWT LNDG WAS MADE. AFTER LNDG; IT WAS THOUGHT THAT ACR TURBO 2380 POLY OIL ESTER HAD ENTERED THE PNEUMATIC STREAM FROM THE L ENG (FIRST FLT AFTER L ENG CHANGE). WHEN HEATED OR INHALED; THE OIL CAUSES HEADACHE; NAUSEA; AND INCREASED PULSE RATE. ALSO CAUSES CONFUSION. THE PARAMEDIC STATED THAT IT CAUSES A NARCOTIC EFFECT; THOUGH COMPANY MEDICAL SAYS THAT THAT IS AN OVERSTATEMENT OF THE EFFECT; THAT IT IS BENIGN HAVING LITTLE EFFECT. THE EFFECTS DID LEAVE AFTER 12 HRS AS STATED BY MEDICAL.