Gday folks

I am a newbie to this biodiesel and every piece of info I get I cherish

I have been reading and searching for days and cannot find any info on what would happen if a small amount of used engine oil was mixed with WVO before making biodiesel

the story

I acquired about 100lt of WVO and I put it in an old 200lt drum that was used for storage of waste engine oil (drum was well drained but there could have been up to a cup? of oil stuck to the inside of the drum) the black engine oil has coloured the WVO a fair bit

so will the process of turning it into biodiesel affect the reaction?

thanks for any input

cheers Murf