The direct introduction of crude oil samples diluted in organic solvents to be analyzed by inductively coupled plasma-atomic emission spectroscopy (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS) is an attractive way to perform elemental analysis, particularly in high sample volume facilities, where turnaround time is critical. Here, it is presented results obtained by performing direct injection of a broad set of petroleum crude oils diluted in o-xylene and analyzed by ICP-OES/MS. By utilizing proper sample preparation and instrument tuning parameters, we set out to assess data accuracy, standard deviation, and recovery, particularly in the region of mg kg–1 to μg kg–1. A multielement Conostan standard (10 elements at 2 mg kg–1 in crude oil) as well as NIST 1634c CRM were selected for this purpose. In general, the data from both instruments were comparable regarding precision, relative standard deviation, and recoveries for metals evaluated at a concentration range of interest. The pot...