My 1998 ML 320 has 133,000 Miles and has low compression on cylinder number 5. 70 psi dry, 110 psi wet. I assume this means problems with the rings sealing in that cylinder, so I need a rebuild. Does anyone out there know a good engine exchange rebuilder? Or a local rebuilder in the SF Bay area?

The frustrating thing is the only real problem is that it has a bit of a rough idle, otherwise the engine runs OK. But the low compression causes the check engine light to come on and now it will not pass a smog test unless I fix the problem.