Someone correct me if I’m wrong here, but I’m pretty sure that the cities only demand ‘Goods’.
If I understand you right – you’re trying to deliver raw Timber and Oil to the city?….they don’t want that.
If I misunderstand you and you meant the ‘Goods’ product from the Oil refinery and Sawmill then, in that case, you probably have the same problem as me. I posted a few days ago trying to find out how we can ‘gauge’ or ‘control’ the demands of the cities. It seems to me that when you’ve supplied them with ‘enough’ goods from one industrial chain, then no other industry can get a look in. Or another industry might take over supply and your first industry will falter. Either way there seems to be a city ‘limit’ to the amount of Goods that can be sent to it.