I think that:
-The reliability problems brought up before, originated from the Daimler-Chrysler days.
-There are two concurrent lists: The Service A & B lists, then the maintenance card list. So you may be at a service B mileage, but then the maintenance card adds gearbox and differential service and then it gets expensive
-There was a time, in the 80's when Mercedes was run by engineers and reliability was most important. Back in those days a scheduled Mercedes maintenance session included simple operations. But the number of those simple operations was most amazing and eye opening. So yes, they charged you, but you could sit back and watch the technician continuously working on the car for 2 hours, it was reliability the German way:
-Check every electrical control and indicator in the dash
-Check every night time illumination bulb in the dash
-Check and align every body panel, check the gaps of the body panels, lubricate the hinges, adjust the height of the hood and trunk
-Baseline alignment check
-Headlight beam geometry check
-Cleaning drains for the windshield cowl and sunroof, lubricating sunroof rails, check rain gutters at the roof
-Check drainplugs in the trunk, the W126 had rubber plugs with holes in them, make sure those aren't clogged
-Adjusting jets of washer nozzles for windshield, rear glass and headlights. I believe that headlight bulbs were on a maintenance replacement, not as-they-burn.
-Refilling all fluids with OEM
-Checking all wipers travel and parking positions, checking that headlight wipers operate in sync
-There was something about lubricating the chassis, don't know exactly what it meant, maybe there were some of those grease gun fittings, that the dealers knew about
-Check tire wear and condition, including pressure in the spare wheel
-Rotate wheels, but then apply the Mercedes torque to the wheel bolts. You should see how long the wheel bolts can be on a W126. Wrong torque and they're stuck.
-Measure the relevant height at every wheel well, to determine the condition of the suspension spring
-Exhaust and brakes checkups
-Medical kit, only the carry bag stayed, the medical supplies get replaced, as they expire
-Check completeness of the tool and spare wheel kit, replace if something is missing
-Seat belt retractors, headrest function going up and down, rear for folding
-Telescopic radio antenna lubrication with special graphite grease
-Everything has filters in the old Mercedes, replace stuff like power steering and fuel filters
-Determine condition of suspension shocks (most of the old school cars don'
t have McPherson suspension and therefore no struts)
-License plate bulbs
-Pneumatic door locks
-Completeness of travel of rearview mirrors going up and down, to make sure that motor doesn't jam
-Keylock mechanism for trunk and front door lubricated with special graphite grease
-Then the more common tasks, wiper blades, air filter, oil change, brake fluid change
So in time, Mercedes discontinued all these maintenance activities from their service schedule, but they kept the cost for that amount of labor, that's how the A and the B ended up costing so much and giving so little.
Honestly, if i would see a technician working for 1-2 hours and performing all of the above simple but important tasks, I would not mind being charged the cost of an A or B.
PS: Did you know that in the Xentry, for certain modules there is a tab called "User Author data"?
Here are some examples of what this means:
-For the HVAC controls module, you know how when you select a fan speed, there's a dash display that shows the fan speed? It shows for a moment, but then it goes dark?
Well, you the customer have the right to request that the bar fan speed display stay always on.
You request this, then the Xentry allows the technician to implement this without asking permission from Mercedes.
-For the lights in the shifter console of the GLA45: D, R, N, Park; you get to choose the intensity of those lights during the day and during the night. They come from the factory set equal at a factor of 1, they can go to 10 and can be set different for the day than the night.
I can set those with Xentry, because My theory is that Mercedes Engineers mandated that these settings be kept unlocked for the customers to choose, but at the same time, Mercedes bureaucracy never disclosed they're available choices that one can request at the dealer.