I was more impressed with Valvoline MaxLife than with Valvoline Syn. I used to use Valvoline until I discovered this web site. There do not seem to be very many Valvoline fans here. In my car the MaxLife definitely ran better. I regretted buying the syn. I have come to the conclusion (from personal experience and this web site) that the average person is better off with either a good conventional oil (Castrol and Chevron are rated high here), or else Schaeffer's Oil. Of course, if you were involved in racing Redline might be great (and maybe Schaeffer's also). The people at this web site are very impressive-some work for oil companies, many get their motor oils checked out at labs, and others study oil filters or work for companies that make air filters. Every product I have used that seemed to be well regarded at this web site has worked for me. I am trying to decide which way to go-frequent oil changes with the best conventional motor oil and best oil filters I can find at a good price, or extended oil changes with Schaeffer's Oil, and a high quality oil filter. One product I definitely recommend is Auto-RX-I believe strongly that it works. I became addicted to frequent oil changes because of my Dad (he was an excellent mechanic), and because of other influences. It would be very difficult for me to go beyond 3000 miles on an oil change-it would probalby keep me awake at nights.