2002 Honda Accord Burning Oil

Two years ago, I started noticing my Accord was burning oil. There is no smoke coming from the exhaust nor are there any drips. I took it in to the dealer, who said it was the O-ring and that I would need to replace the engine. Here it is two years later, my car is running fine still no other symptoms other than burning about a quart of oil every 500 miles. Is there something else to look for? Thanks.