We had a guy come in the shop on a rant about Amsoil. He said they denied his claim for an engine failure and that Amsoil was junk and the company a bunch of pirates. I asked him to bring in all his paper work and anything he had records for. His vehicle was a GMC truck with a Duramax diesel. He is correct. Amsoil denied the claim. What he forgot to mention was that GMC put a new engine in his vehicle under the warranty. He is still convinced that Amsoil screwed him. No matter what we said to him, we could not convince him that Amsoil was not to blame and that it was an OEM defect. He left still thinking that Amsoil is the bad guy and I'll bet that others will hear his story and believe him.