Why was the question International vehicle registration sticker put On Hold as being related to emigrating (Expat Stack Exchange)?
While it's true that the OP was emigrating to the Czech Republic (it was only mentioned in the comments). The scope of the question related only to whether it was a legal requirement for a Canadian automobile to display an Oval CDN sticker while visiting Europe.
The use of an oval country sticker is only a temporary measure and is not permitted for long term use of cars anyway (If you use a foreign car for more than a year in the Czech republic you have to register it).
While I admit, shipping a car from Canada to Europe is a lot of effort for a short trip, I've seen it done.