Sforno on Exodus 30:24/ספורנו על שמות ל׳:כ״ד

1ושמן זית הין, there can be no doubt that the small quantity of oil mentioned here could not have been sufficient to anoint all the sacred vessels mentioned here including the Tabernacle itself. This could only have been achieved if merely a minute part of each vessel had to be covered with that oil, or, if the quantity of anointing oil mentioned here had been placed in a large container with water and had first been boiled in it, so that the thinned down version was used to accomplish what is described here as “anointing.” There is a disagreement of how precisely this was done in Horiyot 11.