A C210 ON APCH AT 2200 FT EXPERIENCED SMOKE IN THE COCKPIT DUE TO IMPROPERLY ROUTED OIL LINE.

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CABIN FILLED WITH SMOKE. WAS CLRED FOR ILS APCH AND VECTORED TO INTERCEPT LOC. WAS TOO HIGH AND FAST TO PUT GEAR DOWN AND UNDERSHOT IAP ALT BY 250 FT. TWR CALLED IMMEDIATELY AND CAME BACK UP TO 2500 FT 1 MI FROM GS INTERCEPT POINT. AFTER LNDG AT FBO; BELLY COVERED WITH OIL AND VISIBLE PUDDLE UNDER ENG. ENG OIL LEFT WAS 1.5 QUARTS. LATER MECH FOUND OIL SENSOR LINE SPRUNG LEAK OVER TURBO WASTE GATE. IMPROPER RE-ASSEMBLY OF HOSES FROM OVERHAUL 16 HRS EARLIER. I AM VERY LUCKY. THIS WAS NOT THE INTENDED ARPT I WANTED TO LAND AT. IT WAS 15 MINS AWAY! THE OIL LINE WAS RE-ASSEMBLED RIGHT ON TOP OF THE EXHAUST SYS (WHICH CAN RUN UP TO 1400 DEGS F). A PINHOLE LEAK COULD HAVE FLASH-FIRED IN THE ENG COMPARTMENT. NOT SEEING ANY CHANGE ELECTRICALLY OR IN TEMP OR OIL PRESSURE; I OPENED WINDOW VENT AND CONTINUED APCH WITHOUT DECLARING AN EMER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED WHEN THE SMOKE WAS DISCOVERED THE DECISION WAS MADE TO DIVERT TO THE MOST SUITABLE ARPT AND WHILE ON APCH; WITH WATCHING THE ENG INSTS; THE AIRPLANE WAS TOO HIGH AND TOO FAST; SO A GAR WAS MADE. THE RPTR INDICATED THAT AFTER LNDG THE RPTR DISCOVERED THE ENG COWLING AND LOWER FUSELAGE WAS COVERED WITH OIL. WITH THE OIL LEFT IN ENG AT 1.5 QUARTS; THE RPTR STATED THAT THE LCL MAINT SHOP FOUND AN OIL SENSOR LINE IMPROPERLY ROUTED AT ENG OVERHAUL 16 HRS TOTAL TIME. THE LINE WAS ROUTED OVER THE ENG TURBO WASTE GATE SUBJECTED TO TEMPS EXCEEDING 1400 DEGS; ADDING THE MAINT SHOP TOLD THE RPTR THE OIL LEAK SHOULD HAVE CAUSED A FIRE. THE RPTR STATED NO EMER WAS DECLARED AND NO CONFLICT OCCURRED.