2 cy ratio
I'm on my 4th tank with 2 cy oil. First two at 128:1. The necessary ratios are different for pre 03 trucks. I believe 02 and back require 128:1. My 03 requires 200:1(16oz/25gal), however the thicker ratio seems to run just fine. I filled this morning, second tank at 200:1 and will see if noise, response,etc. continues to stay the same . If so, it cuts my additive cost to <$1. 40 per tank. If I feel the need to increase to a qt. per fill, it's slightly less cost than Stanadyne but I like the 2 cy noise reduction and response much better. By the way my last tank MPG=20 even, still winter fuel, up from 18. 5 with Stanadyne or XPD. I like 2 cy oil much better... John