The yield of projectile like fragments (PLFs) has been measured in the reac-tions of 16,18 O with 164 Dy and 208 Pb targets at energies above the Coulomb barrier. The experimental data are analyzed to ascertain the role of projectile structure on the multi-nucleon and cluster correlations in transfer reactions. The variation of transfer probabil-ity with the number of nucleons transferred from the projectile to the target nucleus at the grazing angle has been investigated for both the systems. In the case of 18 O induced reactions the cross sections of the two neutron (2n) stripping as well as the 2n-correl-ated cluster transfer are strongly enhanced as compared to the 16 O induced reactions. These results have been discussed on the basis of the possible influence of the valence di-neutrons in the 18 O nucleus on multi-particle transfer reactions.