What was found
RIGHT ENGINE ENGINE OIL - DURING FLIGHT CLIMBING OUT OF 10,000 FEET WE GOT THE LOW OIL PRESS RIGHT SIDE RED WARNING CAS MESSAGE. WE FOLLOWED THE CHECKLIST. WE HAD TO SECURE THE ENGINE AND RETURN FOR A LANDING AFTER DECLARING AN EMERGENCY. AFTER SHUT DOWN WE FOUND THE OIL CAP OFF OF THE ENGINE AND OIL ALL OVER THE RIGHT SIDE OF THE AIRCRAFT. VERIFIED OIL CAP WAS NOT INSTALLED ON RIGHT ENGINE. SERVICED WITH 4 QTS OF 2197 OIL. CLEANED RESIDUAL OIL FROM ENGINE, COWL, AND FUSELAGE. COMPLIED WITH ENGINE TREND DOWNLOAD AND SENT OFF TO TECH SUPPORT. NO EXCEDANCES OR FAULTS NOTED. PERFORMED ENGINE RUN. NO LEAKS OR FAULTS NOTED. TECH SUPPORT RECOMMENDS RELEASING AIRCRAFT. RECHECKED OIL LEVEL AFTER SHUT DOWN. REF HONEYWELL HTF7350 AS907-2-1 LMM 72-00-00 AND CH-350 M/M 05-52-25.