my dad works in the automotive industry and he wants to retire in a view years
No way! Mine too! He owns his own shop in a small town.
my dad works at GM plant 
GM is a very successful automotive manufacturer
they hit a rough spot a few years ago and almost went bankrupt but the government saved them
Yep, but they sold 10 million vehicles in 2016, so they are doing well now
that many? so they have been selling more and more cars over the past few years then
Yep! In 2008 they only sold 8.35 million, so it is a fair bit more nowadays!
I think that is whey he wants to stay with GM and not retire, he will be missing all of the overtime hours
You don't get paid for stuff like personal housework or caring for children or pets!