I do not know if it is luck or what, but my vehicles have consistently lasted me at least fifteen years. I have never once had to update an engine or transmission. I have had to do some particularly minor repairs & maintenance but nothing major. I am particularly thankful for this, then last week, I finally had something quite major go on my eighteen year old truck & that was the a/c. I thought that my truck was simply going to last me forever, & it truthfully still might. I had my hubby try to charge the a/c system to see if that was what was wrong, but it was not. It was nice because the charge had a orange dye in it so that my associate and I could see if there were any leaks in the line. At first, my associate and I did not see any leaks, & the charge only worked for a couple of hours, so my associate and I were confused. My hubby purchased another bottle of the charge with the dye, & this time she did see some orange dye leaking out. She said that she would try to patch the leak if she was able to reach it, & thank goodness, she was. She patched it, & so far, my associate and I have not had any trouble with the a/c system in my old truck. My hubby does not feel the patch will last for long, but my associate and I will see. She told me to look online & see if I can find a current a/c line to update the one she patched just in case the patch does not hold. I found one for a unbiased price, so I put it in my cart, but hopefully my associate and I will not end up needing it.