I use Amsoil also and have had the oil analysis done last year. Right after I sent in the oil sample I found out I had a thrust bearing issue. So I was expecting bad news from the sample. I got an e-mail and a phone call from the lab about the results On the report was a note that the use of race fuel will raise the level of lead in the sample. Many large fleets I have inspected at have oil analysis done on all vehicles as part of there maintenance. It is a good look into what is going on inside the engine. Many issues have been found before they knew a problem existed with a piece of equipment.