SYNTHETIC OIL CHANGES?

I RECENTLY (FEB 26, 2007)TOOK MY O4 LT (45,500 MILES)  TO WAL MART (STORE #1983)AFTER DOING SEVERAL OIL CHANGES MYSELF USING CASTROL SYNTEC 5W-30. WHEN THE SERVICE WRITER (WOMAN IN HER 40'S)ASKED ME WHAT TYPE OF OIL I WANTED, I TOLD HER CASTROL SYNTEC.
SHE THEN TOLD ME "ONCE YOU GO SYNTHETIC YOU CANNOT GO BACK TO REGULAR MOTOR OIL"
 
IS THIS **** FOR REAL? IS WAL MART TRYING TO SELL PREMIUM OIL CHANGES BY STRETCHING THE TRUTH?
ANYWAYS I WOULD LIKE AS MANY RESPONSES AS POSSIBLE TO CONFIRM THIS.
ALSO I THINK THE NEW SS TB'S ARE BAD ASS AND I LOVE THE YOUTUBE VIDEO'S WITH THE WHITE SUPERCHARGED SS
FASTER THAN A VETTE!  SICK AS HELL
 
LIKE A ROCK!
 
 
 

You can go back and fourth with out any problems.  You can even mix them hence the synthetic blends.  They're full of bull.