Well I have some anecdotal info about the BG products, especially their fuel system cleaner (44K). My Brother has worked as a mechanic for an independant garage for the last 8 years, he hates snake oil as much as I do but absoultely swears by the BG product line. His shop used the MOA and 44K daily on a wide variety of vehicles with no adverse results. The only other product they ever use is Lubeguard ATF additive. They put a bottle of lubeguard (not from BG btw) in every tranny they rebuilt. I had a persistent sticking valve in my auto tranny, put in a bottle of lubeguard, problem solved, never returned in 25K+ miles. Back to the BGT products though, I have never used MOA, I am trying AutoRX right now in my motor, with good results so far. I have used the BG products 44K many times on a variety of vehicles, I have been extremely impressed with it's cleaning ability as evidenced by marked increase in idle speed and quality on several fuel injected vehicles. I think it is probably the best think out there short of having your injectors rebuilt/cleaned/balanced. I have never tried Neutra 131 or aoutorx as fuel system cleaners though. I have used chevron techron with good results but I still believe BG 44K to be the best fuel system cleaner available. Thats my $.02 FWIW.