I was at Schaeffers corperate site today. I only say recomendation for this product as a fuel additive. How is it that the parent company is not marketing it for crankcase use if it is such a good cleaner and does not neagatively impact oil performance. This is not meant as a flame at all!! I am just woundering how this product has come to be used of application and how effective it truly is at crankcase cleaning. I ask becuse I would like a cheaper alternative to Auto-RX as a maintnece additive. I am currently useing Auto-Rx in my transmission and engine for cleaning. I have some vechiles that have less then 30,000 miles and I really can not see that expense at this point. I would really like a cheaper alternative for these vechiles. I also want it to work. Thanks!!!!