B3 Service Question
I have a CPO 2020 GLS 450. Purchased in August 2023 with 39,980. Dealer at that time did the 40K service (multipoint, fine particle filter, dust filter, brake fluid, wiper blades)
I did the A service in May 2024 at 44,660 (Oil change and multipoint).
Been getitng the B3 popup (May 2025) at 50,980. Called two dealers for quotes.
- Dealer 1: You need oil change and spark plugs replaced ($1,300)
- Dealer 2: You need oil change, multipoint, cabin filter, air filter, brake fluid flush ($725)
I have a CPO 2020 GLS 450. Purchased in August 2023 with 39,980. Dealer at that time did the 40K service (multipoint, fine particle filter, dust filter, brake fluid, wiper blades)
I did the A service in May 2024 at 44,660 (Oil change and multipoint).
Been getitng the B3 popup (May 2025) at 50,980. Called two dealers for quotes.
- Dealer 1: You need oil change and spark plugs replaced ($1,300)
- Dealer 2: You need oil change, multipoint, cabin filter, air filter, brake fluid flush ($725)
Guess ask a third dealership, third times a charm? and then... the majority wins.




In all cases, as forum colleague W205C43PFL suggested, review the services per the maintenance manual, and specifically ask for what you need. I wouldn't even mention service A or B or whatever... I'd get them itemized list of specific items you need and ask them to not include anything else until they call you.
Last edited by S_W222; May 6, 2025 at 07:41 PM.
In all cases, as forum colleague W205C43PFL suggested, review the services per the maintenance manual, and specifically ask for what you need. I wouldn't even mention service A or B or whatever... I'd get them itemized list of specific items you need and ask them to not include anything else until they call you.
I wonder if they also throw in things like fuel additive or injector cleaners (which well, unnecessary, snake oil? Just use Top Tier fuel) hence that price?




And yes, injector cleaners: one of my former dealers would add a line for 50-60 USD so they can dump that 10-15 USD bottle into the gas tank!
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And yes, injector cleaners: one of my former dealers would add a line for 50-60 USD so they can dump that 10-15 USD bottle into the gas tank!
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Their argument was it meets the necessary certifications 229.5
And yes, injector cleaners: one of my former dealers would add a line for 50-60 USD so they can dump that 10-15 USD bottle into the gas tank!
I have a CPO 2020 GLS 450. Purchased in August 2023 with 39,980. Dealer at that time did the 40K service (multipoint, fine particle filter, dust filter, brake fluid, wiper blades)
I did the A service in May 2024 at 44,660 (Oil change and multipoint).
Been getitng the B3 popup (May 2025) at 50,980. Called two dealers for quotes.
- Dealer 1: You need oil change and spark plugs replaced ($1,300)
- Dealer 2: You need oil change, multipoint, cabin filter, air filter, brake fluid flush ($725)
- Model year 2020
- 2021: A1 engine oil
- 2022: B1 engine oil, brake fluid, dust filter, cabin filter
- 2023: A2 engine oil
- 2024: B2 engine oil, brake fluid, dust filter, cabin filter
- 2025: A3 engine oil, sparks, engine air filters
- 2026: B3 engine oil, brake fluid, dust filter, cabin filter, transmission
- Consider doing diffs and transfer case for longevity even though it's not called out, the G wagon calls this out in their service schedule at year 5/50k
See attached GLE maintenance schedule which is the same for GLS.
Last edited by wildta; May 7, 2025 at 01:56 AM.
- Model year 2020
- 2021: A1 engine oil
- 2022: B1 engine oil, brake fluid, dust filter, cabin filter
- 2023: A2 engine oil
- 2024: B2 engine oil, brake fluid, dust filter, cabin filter
- 2025: A3 engine oil, sparks, engine air filters
- 2026: B3 engine oil, brake fluid, dust filter, cabin filter, transmission
- Consider doing diffs and transfer case for longevity even though it's not called out, the G wagon calls this out in their service schedule at year 5/50k
See attached GLE maintenance schedule which is the same for GLS.
My A service last year was $253.




I have a CPO 2020 GLS 450. Purchased in August 2023 with 39,980. Dealer at that time did the 40K service (multipoint, fine particle filter, dust filter, brake fluid, wiper blades)
I did the A service in May 2024 at 44,660 (Oil change and multipoint).
Been getitng the B3 popup (May 2025) at 50,980. Called two dealers for quotes.
- Dealer 1: You need oil change and spark plugs replaced ($1,300)
- Dealer 2: You need oil change, multipoint, cabin filter, air filter, brake fluid flush ($725)
There are a lot of opinions posted above, based on no information and guesses.
What specifically was included in those quotes?
You could go back and tell each of them that you're Price Shopping and see how they respond.
Most dealers have a "minimum service" menu, and others might offer "just an oil change" without the recommended (required for warranty?) inspections.
Or just ask for the cheapest service, if that's what you're looking for.
But without more information all we get is guesses.
Last edited by mikapen; May 7, 2025 at 01:49 PM.








On the other hand, it seems criminal that BMW charges $150 for their free service.
But the owner also has to authorize those repairs beforehand, so calling Mercedes owners uninformed is kind of uninformed in itself.
We still don't know what the initial quote from the op's post included, so all these responses are pure conjecture.
Last edited by mikapen; May 9, 2025 at 11:28 AM.
On the other hand, it seems criminal that BMW charges $150 for their free service.
But the owner also has to authorize those repairs beforehand, so calling Mercedes owners uninformed is kind of uninformed in itself.
We still don't know what the initial quote from the op's post included, so all these responses are pure conjecture.




Whatever the state, though, they can only exceed the quoted amount by getting authorization via a phone call, message or email, that's notated on the repair order.
The important thing is to realize that it's an actual "Not to exceed" quote that you are authorizing, and also agreeing to pay the charge.
Edit- It's just like getting a re-roof on your house, or hiring a painter.
Last edited by mikapen; May 9, 2025 at 01:05 PM.



