My car is burning through oil like crazy ever since I had it serviced at the dealership in January. I have to top up a liter every 1500 km, that's not normal. The guys say it's wear and tear but I don't think it was like that before.
I'm not surprised you're pissed! A liter every 1500 km is totally excessive and the timing right after the service is way too sketchy to be a coincidence, I'd say they probably didn't close something properly or switched the oil to a viscosity that's not right for your engine.
Go back to the dealership and demand they check what they did in January, it's their job to make sure everything works properly after a service!
The first thing you need to do is write down exactly how much you're consuming before and after so you have concrete numbers to show the dealership, because "a lot" is subjective but "a liter every 1500 km" is solid proof!
They might've loosened a cap wrong, not filled the cooling system properly, or messed with something on the seals during servicing. Go back to them directly with your documentation and ask them to check the oil level and engine condition, they'll be able to tell right away if it's their fault or not!
I had something similar happen with my old Clio once, and yeah it started acting up right after a service. In my case it was the oil cap that wasn't put back on properly, so it was leaking slowly without us noticing.
I'd say first check the new seals they put in and make sure the filter's sealed up tight, because oil consumption that shoots up overnight is usually a leak, not sudden wear.
If you can't find anything obvious, take it back to the dealership with your service records - they're responsible for whatever they touched in January.
Before rushing to the dealership, you need to first check whether the level they set in January wasn't too high. I know it sounds silly but it happens regularly - if the technician filled it above the max mark, you're actually going to burn through oil faster during the first few kilometers, until the excess stabilizes or escapes through the sump. So start by checking the level now with the engine cold and on level ground, and compare it with what you were seeing before the service. If it was really normal before, document your consumption precisely over the next 500-1000 km so you have actual numbers and not just a feeling.
Now, if the initial level was correct and you confirm the excessive consumption, then it's clearly linked to the service. A fill cap that doesn't close properly is one possibility, but they could also have loosened a drain plug, damaged some seal or screwed up the oil filter. One last thing people often forget: check if there's any visible leak under the car or a burning smell, because if oil is dripping into the hot zones of the engine (turbo, manifold) instead of just leaking from the sump, you won't see it pooling but you'll smell it and burn it off anyway.
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