smoke on 1991 Mercedes-Benz 560SEC

1989 560 my engine will smoke (blue) at high speed ,but vewry little at idle

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
2 answers
Suggest also remove valve covers and check cam oiling system.
Valve stem seals are a common problem. They can be replaced without removing the head but requires some special tools to do the job.