Can I ask why you chose a different grade to that specified by MGR, 5w30, or Ford themselves, 5w20 :confused:
US Ford dealers were instructed to switch to 5w20 at the next service if 5w30 was being used for the (stated) reasons of economy and improving start-up oil flow to the timing-chain area of the 2V motor which has a long feed (on one side?). You appear to be going in the opposite direction. Notwithstanding that, Zedtee/Steve's question is "what is the correct oil for 260", not what you or I may have chosen to experiment with, so, as SCP440/Steve says, that has to be a 5w20 grade oil anyway.
David