1tuffram, I think all three of them work pretty well! All of them are very highly rated and were chosen primarily for their exceptional lubricity traits.
They kept my '98. 5 VP44 alive (that in iteslf is a miracle) especially since I was driving on a failed lift pump before I knew any better. Each was chosen as I was just interested in trying out (at length) the "best" of what was out there although, there is one other top notch DFA I have not tried (that I would like to)... the stuff Kevin Dinwiddie represents... the name escapes me right now.
Anyway,
maybe after the Amalgamated.
BTW, the Amsoil DFA I was using had the blue label (I believe I didn't list the name of the stuff exactly right in my previous post).
One thing I noticed last time I was in Cummins NW (Renton, WA)...
they now sell Red Line 85+ right along side the Cummins DFA.
The Red Line DFA has an extremely loyal following!
Me? Even though I'm an "Amsoil Dealer" I've been an extremely long time proponent of synthetic products (OVER twenty years!). It wasn't until several short years ago that I even tried Amsoil. However, I have tried a great many of their products (since), and for the most part, liked them but...
I'm ALWAYS on the lookout for the BBD (bigger, better deal)! So, with that, I use a mixture a different brands of synthetics in my vehicles.
You know what they say...
sworn to fun, loyal to none!