CAPT OF AN LTT ACR ACFT EVACED THE PAX ON THE TXWY WHILE TAXIING FOR TKOF DUE TO HVY SMOKE FROM 1 ENG.

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DURING TAXI FOR TKOF; I NOTICED A LOW OIL PRESSURE INDICATION FROM MY L ENG. THE PRESSURE WAS NOT LOW ENOUGH TO WARRANT ENG SHUTDOWN YET; BUT CONTINUED TO LOWER AND I RECEIVED A LOW OIL PRESSURE WARNING LIGHT. I THEN DECIDED TO SHUT THE ENG DOWN BY THE FEATHER LEVER. DURING THE SHUTDOWN AND SHORTLY AFTER; I NOTICED AN ABUNDANT AMOUNT OF SMOKE COMING FROM MY L ENG IN EXTREME AMOUNTS. THE SMOKE DID NOT SUBSIDE OR LESSEN AFTER SHUTDOWN; IN FACT; IT BEGAN TO INCREASE IN AMOUNT AND RATE SHORTLY AFTER SHUTDOWN. I TOLD THE FO THAT WE'RE GOING TO GO AHEAD AND EVAC AS A PRECAUTION DUE TO THE CONTINUING SMOKE. NO FLAMES WERE SEEN AND I HAD NO FIRE WARNING. I INSTRUCTED HIM TO EVAC L THROUGH THE MAIN CABIN DOOR AND INFORM THE PAX ACCORDINGLY. I PROCEEDED TO SECURE THE ACFT AND COM WITH ATC -- TWR. TWR ASKED ME IF I WANTED CRASH/FIRE/RESCUE EQUIP AND I STATED 'YES; GO AHEAD AND SEND CRASH/FIRE/RESCUE.' I THEN FOLLOWED THE PAX OUT OF THE ACFT GIVING EXPLANATIONS ALONG THE WAY TO PAX. I GATHERED THE PAX IN A SECURE AREA; TAKING INTO ACCOUNT THE POSSIBLE FIRE HAZARD AND ARPT SECURITY. I TOLD MY FO TO WATCH THE PAX AND TAKE CARE OF THEIR NEEDS WHILE I COORDINATED WITH CRASH/FIRE/RESCUE. I COORDINATED WITH CRASH/FIRE/RESCUE; AND OUR COMPANY MAINT UNTIL ALL WAS SECURE. THE CRASH/FIRE/RESCUE COMMENTED ON OUR PROC AS BEING CORRECT AND GOOD. I THEN PROCEEDED TO TAKE CARE OF OUR PAX NEEDS. THE CRASH/FIRE/RESCUE GAVE US A RIDE TO OUR OPS. HE ASKED ME FOR NO INFO. IT WAS A PRECAUTIONARY EVAC AND NO EMER WAS DECLARED. THERE WERE NO INJURIES; AND I FEEL THAT NO FARS OR COMPANY PROCS WERE VIOLATED. THE PLANE WAS JUST WRITTEN UP FOR AN OIL LEAK L ENG JUST PRIOR TO ME TAKING IT. COMPANY MAINT OFTEN DOESN'T REGARD OIL LEAKS AS SERIOUS; AND SIGNS THEM OFF CARELESSLY (IN MY OPINION). COMPANY MECHS TAXIED THE ACFT AWAY BEFORE I HAD A CHANCE TO MAKE A MAINT LOG ENTRY. HOWEVER; THEY MADE A LOG ENTRY THEMSELVES; WHICH WAS NOT THOROUGH (IN MY OPINION). I THEN COORDINATED VIA TELEPHONE WITH MY COMPANY.