What was found
ENROUTE, NOTICED A PERSISTENT ODOR. AFTER ABOUT AN HOUR, BOTH PILOTS HAD SLIGHT EYE IRRITATION. BOTH PILOTS USED OXYGEN. ODOR SEEMED TO DIMINISH LATER IN FLIGHT. CHECKED MAIN, FWD AND AFT LOWER LOBE AND BULK CARGO AREAS. NO SPILLS FOUND OR REPORTED BY UNLOAD CREW. FOUND EXCESSIVE LUBRICANT ON CAPTAINS SEAT TRACK WITH ACCOMPANYING ODOR. CLEANED SEAT TRACK. RAN ACFT PACKS 2 HRS. NO ODOR NOTICED.