additives

[firecapt21]

can anyone tell me which are the best additives for
the 6.4 and do they help?

[mick1955]

Take a look at this.

[bigred_stroker]

WOW! Thanks mick1955. That is some very useful information. I have always used Diesel Kleen, and I feel like I can see a difference in the mpg, but I didnt realize that it wasnt so great when it came to protecting your engine.

[hotlicks2go]

I've ran about 150 gal. w/ opti-lube xpd.. May help but I haven’t seen any noticeable differences or improvements over plain fuel.

[pyro2nite]

I guess the question is, what do you want it for? If it for fuel mileage or extra lube for the injectors? I just got off a 3265 mile trip pulling a 9600lb 5ver and tryed two different additives, Opti-lube xpd and Ford Centane booster. I was trying to see which would incresse the fuel mileage. I stared with the opti-lube xpd then some where about half way through the trip switched to the centane booster. Results? it was all over the board. The reason? The driving conditions were hardly ever the same. Going East bound it seemed there was a head wind most of the time. Traffic and speed limits differed. If you pressed hard for an answer I would give the centane a slight edge.And I do do mean slight. With the cost of Opti-lube xpd you would need to see a big increase in MPG to off set the price. I did a simular test driving the same route (not the 3265 mile one) earlier in the year without the 5ver and again slight edge to the boost. OH, my overall mileage with the 5ver was 10.6

[stunya]

i have been using the cetane booster for about 3 tanks...mileage seems up a touch...hardly noticable at all. I would guess its probably one less regen here or there.

I figure its just money well spent, even if its just for the protective properties etc...

good luck

[mick1955]

I too have always used Diesel Kleen, still do! I've never been able to tell when switching from one to another if it has ever helped. About the only thing I haven't tried is the Opti-Lube. Guess that's next on the list. I agree with stunya, figure it's money well spent, even if it's just for the protective properties!