I purchased a 19-dollar part from Global Automotive with a "Lifetime Warranty". After only 5 months the part failed, resulting in additional labor to replace it again.
I contacted Global Automotive. They stipulated that I had to include proof of professional installation.
They denied the claim, on the grounds that the part was not professionally installed. I am a retired mechanic with over 40 years of professional experience!
I waited for two weeks and did not hear from them and was told that my claim would been denied only after I contacted them to find out the status.
It showed me that a warranty is only as good as the integrity of a company.