Honda civic 2018 - 11,500km but no oil change?

While this is unusual, it's important to note that the Civic takes only synthetic oil (0 weight motor oil). It's right on your oil cap (0w-20) if you look under the hood. It's been that way since 2011.

Starting with the 2011 models, most new Honda vehicles will come from the factory with the Honda engineered 0w-20 synthetic oil.

Synthetic oil lasts a lot longer than regular oil. 11,500 km is about 7000 miles. I tend to get 8000-9000 miles between changes (2013 Civic), and I change it when the dash starts complaining about low oil life (about 10% estimated life remaining). I used to know a guy at the Honda dealership I bought it from and he confirmed he got about the same on his vehicles. Check your dash menu for the maintenance data and it should list an estimated oil life remaining. 7000 miles in 2 years is not a lot of miles, all things considered.

I would go ahead and replace the oil anyways, since you're going to be close to needing to regardless of how much life it has left. Synthetic changes are more expensive, but your engine is designed for it, and it's offset by the longer life.

For info, just read this in the owner manual:

If a Maintenance Minder indicator does not appear more than 12 months after the display is reset, change the engine oil every year

http://techinfo.honda.com/rjanisis/pubs/OM/AH/ATBA1818OM/enu/ATBA1818OM.PDF

Whenever I come across an incomplete or questionable service record I assume it wasn't serviced. I always recommend an oil and filter change on any used vehicle. This way you can start your own service interval and monitor things like oil consumption. I would also include things like timing belts that can cause severe engine damage when they fail. Many people will opt to sell or trade an older vehicle when a major service is due rather than pay for the service.

Manufactures of vehicles have guidelines for oil changes. These will be found in the owners manual. They almost with no fail give an oil change requirement of miles driven and also a specified amount of time because oil degrades over time. Many times driving conditions are factored into the mileage requirements as well. Any manual I've seen requires that the oil is to be changed in 12 months even if the milage requirements have not been met. Most late model cars will earn you to get an oil service when milage requires it or it has been 12 months since the last service. If the car does not have an active service reminder lit up, I would assume that it has been serviced without the Carfax s knowledge.