ASSISTING MECHANIC, PLACVED 55 GAL DRUM OF OIL IN LOADER BUCKET. TOOKE TO AREA IN SHOP WHERE WORKING ON EQUIPMENT. UNLOADED DRUM. WORK ANOTHER HOUR THEN WENT HOME. DEBVELOPED BURNING SENSATION IN RIGHT THIGH ON WAY HOME. COULD NOT USE LEG VERY WELL THAT NIGHT. WENT TO ER AND TOLD THINKS HE HAS TORN MUSCLE /TENDON.