What is Average Reliability?
Hope this isn't too much of a noob question 
I have a engine which has 68 in reliability...

...but at the "Overview" page, the car itself gets a zero for average reliability.

What does the zero average reliability mean?

I have a engine which has 68 in reliability...

...but at the "Overview" page, the car itself gets a zero for average reliability.

What does the zero average reliability mean?