I think you would seriously shorten the life of the PSD. But if it's got 400K worth of miles on it then it may not matter to you. In that case I'd go for it and let us all know how it goes.
ok thanks. my truck is no where near 400k miles, it almost has 97k miles right now and is just getting "broken in" LOL. i would love to get that many miles out of my truck but somehow i doubt i could drive it that far or own it that long.