The issue of adding a fuel lubricity product to your fuel tank is some what dependent on where you live, I can only talk about Atlantic east coast cause that's the bulk of the fuels we sample and test, The EMA < eng mans assoc > have a lubricity standard called HFRR, The min # is 460 HFRR, The good old high sulfur pre 2005 fuels were Diesel #2 350/390 HFRR Those days are gone, The low sulfur we have seen after 2005 has been 390/500 HFRR and now for Ultra low sulfur 600/800 HFRR
, Note... the higher the # the lower the lubricity, The good news is we have not seen any Ultra low diesel for marine fuels yet on the east coast & most of the fuels tested have been under 460 HFRR. There are some engines that will require some form additive in the future when the marine industry must comply, It seems to me that most people are just selling extra protection that may not be needed, Its a easy sell
We recommend for long term storage tanks should be empty and cleaned before use, Good topic fellas