I can speak only to the drivetrain...it's essentially the same as that in my '92 500E. I'd have someone experienced take a good look at your monobelt tensioner; they die eventually but are reasonably cheap to replace. Distributor caps ever done? Brake fluid & coolant changes? Lastly, I'd post & inquire if anyone has an easy way to check your timing chain guide rails?

Do your oil changes, stay on the maintenance, and it'll go as long as gas is available. Nice car, BTW.

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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo