Just to double check, your GLA 180 does not have a service manual? US version GLAs have a digital operators manual loaded on the control system you could access if part of the 180 configuration. You might also be able to find service manuals online from Mercedes Benz in Germany that are not searchable in the US. Finally, here’s a recent thread with a link to US version GLA service requirements that might be similar for your 180.
Suggest you add location, GLA model and year to your profile as reference in future posts. We have an international membership with a variety of GLA derivatives. That information will display each time you post, under your member name. You can do so from the User CP link on the upper right of most browsers.
2016 GLA250 FWD
Cirrus White, Brown Leather Upholstery, Burl Walnut Trim
Interior, Premium, Driver Assistance, Sport Packages
Rearview Camera, Power Passenger Seat With Memory
Bi-Xenon Headlights, LED Taillights