Just hit 150,000 miles...
Nick
I think maybe you mean valve cover gaskets? I fyou are changing head gaskets, then you should get a valve job as well but I assume you mean head gaskets?
Do normal service and keep the car, as the engines are supposed to be good for 300K or so, if taken care of.. I only have 66K and changed a few engines already, but I race the hell out of them

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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There's 320,000 on 2002 CL55AMG and its drives great feels tight and smooth and everything works as it should, it's been service at dealers from day 1 never missed one last being 2K ago sometimes getting serviced 3 times in a year when the previous owner covered HUGE mileage per year.
So fret not they run for ever as long as its well maintained.
I would also say though up till when I picked up the car it had over £72,000 GBP in repair bills invoices over £51,000 GBP of that was warranty work. My motor through its life has wanted for nothing and been maintained to the highest degree hence the mileage and still going great with no errors when I recently scanned all the systems in the car (diagnostics).
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