Where I'm at you can check a car's safety test history through the government along with mileage.
Srrvice history is another matter and having something accessible would be great, especially for imports. Places like australia and the uk have tons of used japanese imports with no history.
Some cars are serviced but have no documents to prove it. But i don't know how you prove blockchain entries as being true.
They can't be changed of course but what stops them being lies to start with?
The problem still come in with the data capturers that can be corrupted. Garbage in Garbage out... right? You will have to
find a way to "double check" or "verify" the data that are being captured or the automated system that would be adding info
to the Blockchain. You will have to implement different checks in the whole process to keep it transparent.
...The
Blockchain is the solution, but the implementation is very important. { total transparency from beginning to the end }