I just acquired a '86 420sel. My mechanic recommends overhauling the intake system. He wants to take it out changing all the o-rings, air tubes, and sending the intake to a machine shop to get it all the air passages clean and make sure it's straight. All at a cost of $1600.

Is this an easy job to do by oneself? The car is 125k in mileage and 18 yr old. He said that the hoses have all hardened and the o rings the same. These make the system prone to air leak. I do know that he is trying to create more work and increase his income. In his defense, he does not cut corners when he rebuilds these engine.

What do you guys think?
John