Aiming answering the question, if masterbatch dilution is more effective on nanofiller dispersion than direct nanotube incorporation, small-scale melt mixing was performed for composites based on polypropylenes (PP) and 0.5 -7.5 wt% multiwalled carbon nanotubes (MWCNT) Nanocyl NC 7000. For this purpose, the specific mixing energy during processing in a DSM Xplore 15ccm corotating microcompounder was recorded and hold comparable for both MWCNT incorporation methods by adapting the mixing time in direct incorporation. Mixing was performed at 210°C and 250 rpm. In addition, the matrix viscosity of PP was varied using 3 different PP types. The masterbatches had concentrations of 7.5 wt% and were mixed and diluted for 5 min each; the comparison of both methods was performed at 2 wt% MWCNT. It could be shown that the masterbatch dilution technique resulted in better MWCNT macrodispersion, as assessed by optical transmission microscopy than the direct incorporation, independent of the matrix viscosity. Consequently, also the electrical resistivity of samples with 2 wt% MWCNT was lower when using the masterbatch approach. In accordance to literature, with increasing matrix viscosity an increase of the electrical percolation threshold measured on compression molded plates was found. However, in contrast to previous results on other polymer matrices the macro dispersion of the CNTs was improved with decreasing matrix viscosity. This indicates the role of melt infiltration into the primary agglomerates as first step of the dispersion process which is more pronounced at lower matrix viscosity. Thus, the reasons for higher percolation at higher matrix viscosity seem to be the worse dispersion combined with more intensive nanotube shortening. In summary, this study on PP suggests that the masterbatch approach is very suitable for the dispersion of MWCNTs and results in advantages for nanotube dispersion and electrical properties of melt mixed composites.