RepairPal Certified shops can diagnose and repair your 1990 Mercedes-Benz 420SEL. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
What You are talking about is an 8 Hour job plus parts.P.S. if the wrong person does the job and His "short cut" goes wrong and He "drops a valve" then it becomes a Major job.