I assume you meant to state: "I was under the impression that you could NOT change after running regular oil.."
If so, it is not a problem and you have nothing to worry about assuming the engine is in proper operating condition.
'04 ML500 - 53k, Inspiration Edition, Desert Silver
'11 Audi A4 Avant - Brilliant Black
'87 300SDL sold
'99 C280 Sport sold
'85 190E 2.3 sold