The clutch was always problematic and had to be overhauled at a cost of over $2200.00.
The engine seems to be consuming a lot of oil, most often approximately 1 can per 2000 miles. I've never experienced anything like it in any of my cars.
Aside from the problems I've mentioned above, the Celica is a fun car to drive.
Never buy another celica? What you need to do is sell your celica and buy a new one. Most likely the reason for you problems is the owner before you drove it way to hard and burned up the engine and transmition.
Your problem with the oil consumption is a fault which is covered under your engine warranty. Take it back to Toyota. The information is well documented.