I generally keep my vehicles for 20 years or more and have never spent that kind on money on repairs. As others have recommended, just put some of that money in the bank and pay as you go.
Two things to keep in mind:
1) Insurance companies are in business to make money by charging you more than they expect to return.
2) The golden rule of business: The person with the gold makes the rules. Once they have your gold(money) they get to make the rules on how and if to return it. I have heard several complaints on non-factory warranties.
I am in my late 50's and raised a bunch kids. I don't believe that I have spent $8,000 on every car repair that might be covered by a warranty I have ever had combined.