"Bulleteproof reliability" refers to something that is extremely dependable and unlikely to fail or have any issues, just like a bulletproof vest that protects against bullets. Full definition
More sedate than the Civic when it comes to handling, a used Toyota Corolla is still a comfortable ride, and it also offers bulletproof reliability. (autobytel.com)
What's Best: Affordable blend of crossover qualities and Honda's legacy of bulletproof reliability. (wheels.ca)
Citroen isn't generally known for bulletproof reliability and our 2016 Driver Power owner satisfaction survey saw it come 26th out of 27 brands. (carbuyer.co.uk)