Put tenderloin, seasoning mix, seasoned salt and oil in a zip-lock plastic bag. Shake and turn until tenderloin is evenly coated with oil and mix. Place in refrigerator for about 2 hours.
Place on shallow roasting pan for about 35 minutes, or until meat thermometer registers 150F. Remove from oven and let rest for about 10 minutes, at which time the internal temperature will rise to about 160F.