I'm struggling with this because I'm a distributor and we get a lot of phone calls about how long Amsoil lasts. Because Amsoil lasts long for most any vehicle but every vehicle has a little bit of variance, I'm unsure what to tell possible customers so I'm telling the truth but can still keep a sale. I don't want to be accused of lying but Amsoil is a very long lasting, engine lengthening oil. Any advice?