1992 300SL w/ 180k miles.

Car burns 1 qt every 750 miles. Even now when using 20W50 oil. No external oil leaks or signs of blowby. Don't suspect a bad cylinder because all the spark plugs look in similar condition and are not badly fowled. I don't notice any smoke from exhaust even when decelerating. How well does an engine like this respond to replacing valve stem seals?

I recal some MBs were plagued with poor quality valve stem seals from the factory. Would this car/engine be one of them? Does this car have a common problem with excessive oil burning from some other cause?

I once replaced the valve stem seals on a 1990 2.6L 190E w/ 250k miles and the oil consumption problem went away. But this was a known problem on these engines.

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1972 450SL
1982 300D Turbo