I bought a used '92 300e in mint condition but it burned about a quart of oil in 750 miles. I replaced the valve stem seals without removing the head (using air pressure) and the car uses no oil now between changes.

It's amazing how much oil can leak past the old, brittle valve stem seals. If I had a oil consumption problem, I would first replace the seals, leaving the head in place (less than $20 for parts) before going through the trouble and expense of removing the head.

If the head does need to be remove I would have things such as warpage and valve guide wear checked by a competent shop.