Start with the 100K service overhaul. Engine, and tranny mounts, only from MB. Febi is low quality grade merchandise, seek superior quality if you want to skip mb, not below OEM grade. Brake disc's will need to be replaced, at low speeds they will cause a partial vibration along with the engine and tranny mounts, and tie rods. Check complete suspension bushing all around to gauge the life on the components. Your turbo charger from Garrett needs to be inspected and change the o rings on the metal pipe, they will crack during the refitting. Transmission 722.9 valves, conductor plate, filter, o rings, and gasket would be a good replacement OEM or Mann, get the fluid out of the torque converter as well, pick up fuchs Titan 134 or Motul (236.14). Wheel bearings, serpentine belt tensioner and the belt non OEM would suffice. Power steering pump and rack check is a must, and do flush out the fluid same as tranny fluid would be adequate. Give the brake lines a check and replace the fluid with top grade motul rbf series for nimble braking. 2 intake seals would always need replacement whenever we swap the air filters out, weak seals. Change the intercooler seals with new upgraded purple ones from MB. The best tires after 3 sets I've liked are Michelin Pilot Sport 4S (released this year), I've played with Conti Sport Contact 5, Pirelli P Zero, and Pirelli p7. Out of this lot PS 4S are the best for comfort and quick cornering. Airmatic would require a recalibration of the star computer shows any deviation in the standing levels. Only invest in Mercedes-Benz Star diagnostics for this car, rest of all is not great. Xentry is good for certain things, but star is always better to have nevertheless. Brake sensors never need to be MB, any cheap Chinese sensor will do. As for the ac compressor and gas, o rings, hoses, evaporator, expansion valve, just stick to MB, other stuff is more prone to weak quality checks and will cause leaks. Bulbs, I prefer German Made Philips or Osram, and Leds have to be MB OEM replacement, I've tried cheap Taiwan and Chinese led head lamp and tail lamp replacement and they didn't last 2 years, before I could hit the 7 month mark a few failures were eminent, after 2 years they were useless. Only MB solutions for lighting. For differential I've only used MB and 3rd party Motul 75w90 synthetic oil. Brake pads Textar has some great A grade rating pads which were better than Brembo of the same grade, they lasted longer and performed better when cold and hot. At all costs avoid apple car play Chinese and Malaysian kits and Android in dash system, they will ruin the MB system and when the aftermarket stuff fails, everything connected to the system will be on hold. Last bit change the airmatic filter frequently, get it OEM or from Mann, replace all fuel injectors and fuel filters with gaskets and o rings, OEM.
*Do not use any flushing chemicals, hoses, pipes, and o rings are old, seals are bound to be damaged by doing so.
**Motul Xmax 0W40 is great for the engine, along with Hengst oil filters, but not hengst white o rings.
***BMC air filters are the best, get the Ecu, transmission, and airmatic tuned for better performance from a specialist aim for 20% higher power, stiffness on airmatic movement, and quick shifts. BenzNinja is great for this job, look him up.
****Service intervals from personal experience
1. Brake fluid 10K KM or 2 years
2. Engine oil 5K KM or 1 year
3. Coolant 30K KM or 2 years
4. Diff fluid 20K KM or 2 years
5. Tranny 30K or 2 years
6. Steering fluid 40K or 3 years
7. Cabin ac filter every year
8. Airmatic Air filter every 2 years
9. Air filter, if bmc clean them twice in a year, if OEM grade replace at the least each year.
