Did they say how much oil was burned. I would check your oil at least once a week. And keep extra oil in the car. I have a slight oil burning problem on my 98 corolla. I switched to 10w30 and use full synthetic oil. That seemd to slow the oil consumption down Right now i am using a product called auto-rx. This stuff is a gentle cleaner that works over a extened period of time to clean the internals of your engine. Check out the website www.auto-rx.com
for more info and its use and effectiveness. Just a thought to help out your engine before it develops into a bigger problems like burnt pistons or leaking valves. It is possible that your piston rings are stuck coked with carbon build up or sludge. There are alot of post regarding the "oil consumption issue" with our corolla's.