I've never seen references to the use of walnut oil for cooking as in frying, only as an ingredient for salad dressings, where the flavor is prized. Why not for cooking-- don't know if that is due to expense or a low smoking temperature. There's lots of "gourmet" oils, another one is avocado oil, which can be used to cook in, and is also prized for dressing salads. Also very spendy. These are like the super-premium extra-virgin olive oils, employed for their flavor. Both are very tasty, I occasionally score a partial bottle when some friends decide their 'fridge is too cluttered.
I can't justify the cost of purchase though, unless for a very special occasion. Rather buy good beer.
The varieties of orange oil I've seen all have some petroleum distillates in them, as far as I can tell.
I guess I'm wondering if walnut wood-finishing oil can be easily concocted from the culinary product.
On the buffing, what I meant is if I use the Howard product (a paste wax) to protect the blade, I can't buff it up so I doesn't look a little cloudy or streaky. I think that pure carnuba wax resembles a lump of parafin, so unless you want to load up a buffer wheel from a wax block, some type of meduim is needed to get a paste. For the Howard product that medium is orange oil, which makes it great for the wooden handles. Brings out a lot of depth to the grain. I've gotten slightly better results and penetration by cutting the product with a little orange oil and using it hot (totally melted), but it's probably not really worth the trouble. It does buff out very well on the wood. I use it as a final coat on handles that have received the Walosi treatment as well.