C180 DEP FROM ABQ; EXPERIENCED MECHANICAL PROB; RETURNS AND MAY HAVE LWOC.

Narrative

I HAD TAKEN OFF FROM ABQ; CLBING OUT VFR TO DEST. ABOUT 2000 FT AGL ON CLBOUT; I NOTICED MY OIL PRESSURE DROPPING. IT WAS DOWN TO 25 PSI FROM ITS NORMAL 55 PSI AND WAS SLOWLY CONTINUING TO DROP. I WAS TALKING TO ABQ DEP; AND TOLD THEM I NEEDED TO RETURN TO THE APT DUE TO OIL PRESSURE LOSS. THEY ASKED IF I NEEDED THE EQUIP AND I DECLINED. DEP SWITCHED ME BACK TO TWR. I DO NOT KNOW IF THE TWR CTLR WAS INFORMED BY DEP CTL OF MY LOW OIL PRESSURE SIT. THE TWR CTLR TOLD ME TO FOLLOW A B737 ON A 6 MI FINAL TO RWY 3; AND TO RPT WHEN I HAD THE B737 IN SIGHT. I SIGHTED AND RPTED CONTACT ON THE B737; AND AT THAT POINT; I WAS TOLD TO FOLLOW HIM ON A VISUAL APCH TO RWY 3. I ALSO HEARD; I THOUGHT; THAT I WAS CLRED TO LAND BEHIND THE B737. SO I FOLLOWED HIM; AND WHEN HE CLRED THE RWY; I WAS ON APPROX A 2 MI EXTENDED R BASE. I TURNED FINAL AND WHEN I REDUCED THE PWR TO LAND; THE OIL PRESSURE DROPPED ALMOST TO ZERO; MAYBE HOLDING 5 PSI. I THEN LANDED. DURING MY LNDG ROLLOUT; THE TWR CTLR CALLED ME AND ASKED IF I WAS READY TO TURN BASE LEG. I REPLIED THAT I WAS ALREADY ON THE RWY ROLLING OUT; AND THAT I HAD BEEN CLRED TO LAND. AFTER A PAUSE; THE TWR TOLD ME TO TURN L AT THE NEXT TXWY AND CONTACT GND CTL; WHICH I DID. GND CLRED ME TO TAXI TO THE RAMP. THERE WAS NEVER A REQUEST BY THE TWR TO CALL THEM ON THE PHONE; AND I NEVER HEARD ANYTHING MORE ABOUT THE INCIDENT. THERE WAS NEVER EVEN A REMOTE POSSIBILITY OF A CONFLICT WITH THE B737 OR WITH ANY OTHER TFC IN THE AREA AT THAT TIME. IN HINDSIGHT; I STILL BELIEVE I HEARD THE TWR CLR ME TO LAND. HOWEVER; I CANNOT PROVE THAT WITHOUT ACCESS TO THE TWR RECORDINGS. IT IS POSSIBLE THAT IN MY HASTE TO LAND AS I WAS CONCERNED ABOUT HAVING AN IMMINENT ENG FAILURE; THAT I HEARD WHAT I WANTED TO HEAR -- I MAY NEVER KNOW.