Just a little heads up on the mink oil thing. Mink oil is rendered from mink fat so make sure you apply it in your garage so that the PETA people can't see you doing this, otherwise you might initiate a small flash protest.
Now to the more serious bit. Mink oil is about the most unsaturated of the animal fats; but, does appear to have better long term stability than other unsaturated fats. However, it can go 'off'. This might not be so noticeable on a pair of boots; but, might be more odorous in an enclosed space like an NSX. As it turns out, most mink oil products are not pure mink oil and may contain lanolin and various silicon based products which reduce / eliminate the rancidness issue. Just something to be aware of when shopping for the product - more rather than less mink oil may be better.
I have used beeswax based products. There are a number of different vendors / variations. The downside is that they take longer to absorb (some a lot longer than others - think sno seal) and some of them definitely need some serious buffing to remove residue. They will leave a very slight polish on the leather.