OP should read this. The oil burning issue isn't necessarily due to wear (although with the mileage it could be).If you go to Toyota Nation.com or corollaforum.com you should find that your engine has a very common problem for that year and engine. Toyota issued a service bulletin that takes some investigation to learn about. But in short there are not enough holes in the piston to allow for oil to flow to the oil control rings. With dino oil, this part of the piston and the amount of restricted flow gets so hot that oil gets burnt/ carbonized. The fix at the time was to replaced pistons and oil control rings to allow more flow. If you research deep enough, some have drilled a few more holes in the pistons and filed the control rings some to allow for more flow of oil to fix the oil burning and sludging the motor. The other option is too just use MOBIL 1 Full Synthetic High Mileage which is excellent at removing sludge in your engine. I did this on my 2002 Corolla and my oil consumption dropped but not too much longer I developed a leak on a seal that should have been replaced anyways. You can use some seafoam in the gas tank and in the oil just before a oil change. Get yourself a good filter and use the Mobil 1 and see if things get better. You should run a longer oil change interval close to 10000 miles.