Originally Posted by wensteph
I've used FPPlus in gas and diesels (yes, it works well in either) for years also. I started it on Terry Dyson's recommendation and the other additive he liked was Renewable Lube's Bio-Plus. I've used it also in gasoline engines. They push cleaning more than UCL in their advertising, but there would be some UCL benefit since it's a bio base. Schaeffer's Soy Ultra is good, but the treatment ratio is so high it's not cost effective. My vote goes to RLI's Bio-Plus.
What's the deal with the treat rate? Looked up both and both soyultra and bioplus recommend 1:2000 as a maintenance rate. Could you be thinking of neutra?
So, purchased by the gallon with shipping to me, so far the cost breakdown per 20gal tank of gas looks like this
FP+ $1.84
BioPlus $0.60
SoyUltra $0.54
Any significant differences that would make bioplus a better option or should i just go with best price?