Valve stem seals
Have just replaced the valve stem seals on my 500se and oil consumption problem has gone, like the other guys have said, the bottom end lasts a long time, you will need one special tool to do the job other than that it’s a reasonably easy job without taking off the heads, there is a full procedure for it on this or another merc forum. The seals are as cheep as chips, I paid US $ 1.50 each ( $24 for the set ) the valve compression tool I made. Good luck
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