Isn't truffle oil just a big old con, just a bunch of random chemicals with a funny smell, with basically no link to real truffles except smelling vaguely like them. It's just something dirt cheap that people put in dishes to make them sound expensive, without having to actually use an expensive ingredient like truffles. Similarly aged parmesan – unless they tell you what it is, it could be cheap stuff that cost em 5p.
Truffles on the other hand, they are jolly nice. I went to a restaurant in Como that specialises in truffles and mushrooms, at the height of the mushroom season once, and had their special truffle menu – white truffle and chestnut or something soup, black truffle and mushroom pasta. That was a very memorable meal.
Joe