Keep in mind that the allies kept Spain on a very tight leash to prevent them being much of a "conduit" for supples and Italy likely would have been treated the same way. Spain did have tungsten and there was something of a bidding war for it between the Western allies and Germany. However when it comes to oil for instance the allies calculated how much Spain needed and delivered something less than was desireable for Spain alone. Of course since Germany couldn't even keep Italy or herself in sufficient oil adding the burden of Spain as well would have been a stretch. Some of the Spanish higher ups apparently did very well for themselves accepting bribes to do what was actually best for Spain and likely what Franco wanted as well.