Diesel fuel additive - Dodge Cummins Diesel Forum
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post #1 of 55 (permalink) Old 12-09-2019, 12:18 AM Thread Starter
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Diesel fuel additive

Do I need to be using power service every time I fill my 2019 ram 6.7? Thanks

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post #2 of 55 (permalink) Old 12-09-2019, 02:14 AM
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post #3 of 55 (permalink) Old 12-09-2019, 11:04 AM Thread Starter
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No? Why
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post #4 of 55 (permalink) Old 12-09-2019, 11:06 AM
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Because it’s not necessary, despite what their ads will try to sell you.
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post #5 of 55 (permalink) Old 12-09-2019, 12:08 PM
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Quote:
Originally Posted by farmdiesel44 View Post
Do I need to be using power service every time I fill my 2019 ram 6.7? Thanks
No, you don't have too.....but I do about every time....I use Power Service...the reason being I have an auxiliary tank in the bed so I pour it into my 60 gallon tank....maybe not every tank. If I'm running through it on a long trip...I don't use as much....but I definitely do when I don't run her much and it sits in the tank for a couple of weeks.
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post #6 of 55 (permalink) Old 12-09-2019, 12:24 PM
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No? Why
What does the manual say?

-39C (ambient) this morning, and for most this week, so I do have the white (winter) power service in the tank to be safe.
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post #7 of 55 (permalink) Old 12-09-2019, 12:37 PM
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I understand Cummins recommends it. I have no idea why - they aren't known to have given a reason.

I doubt, as has been said, that it is because they get a kickback. It would be a trivial amount versus something like x brand diesel fuel - or tires - or recommending their own additive. I find a significant MPG increase and engine quieting when I use it in my mildly modified 1998.5 24 valve. I find NO difference when I use it in my 2015. I've tried it, on and off, many times and observed no effect. The high mileage drivers here seem to have tried it, and report no detectable benefit. People from the far north and deep south report no detectable benefit. people from dry and humid climates report no detectable benefits. Heavy haulers to semi-monthly grocery getters report no detectable benefit. I've never heard of a warranty denial for not using it.

If you're not included in one of those groups give it a try and let us know the result. Otherwise join the crowd of happy non-users.

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post #8 of 55 (permalink) Old 12-09-2019, 01:05 PM
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Per a reputable independent diesel only repair service I have had work done and trust, "because the advent of modern diesel fuel is woefully low in critical chemistry ie. lubricity, cetane etc. and is essentially very dry fuel", they recommend adding a diesel fuel additive, whichever brand you choose with each fill-up and no more than every other fill-up. I have seen no reliable evidence to the contrary and have no reason to question them. Considering the cost of these trucks it seems like false economy to save on either not using or minimally adding a diesel additive. So I add it at every fill-up.

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post #9 of 55 (permalink) Old 12-09-2019, 01:28 PM
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Per a reputable independent diesel only repair service I have had work done and trust, "because the advent of modern diesel fuel is woefully low in critical chemistry ie. lubricity, cetane etc. and is essentially very dry fuel", they recommend adding a diesel fuel additive, whichever brand you choose with each fill-up and no more than every other fill-up. I have seen no reliable evidence to the contrary and have no reason to question them. Considering the cost of these trucks it seems like false economy to save on either not using or minimally adding a diesel additive. So I add it at every fill-up.
Because of lackluster “evidence” from “reputable” diesel shops, I use the best.

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post #10 of 55 (permalink) Old 12-09-2019, 01:31 PM
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Originally Posted by Lins View Post
What does the manual say?

-39C (ambient) this morning, and for most this week, so I do have the white (winter) power service in the tank to be safe.
I can't relate to that kind of cold so do whatever you need to keep fuel flowing. Sounds like a good place for gasoline.

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post #11 of 55 (permalink) Old 12-09-2019, 03:36 PM
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Saw an interesting test done by a Youtuber (Project Farm). He has some interesting testing on a variety of products.

Here is a video of his testing of diesel additives:

I'm not crazy about some of his tests, however the lubricity and gel tests appear valid and "may" translate to real world benefit.
However, without understanding the emissions differences and corrosion for actual fuel system materials I'll remain skeptical.
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post #12 of 55 (permalink) Old 12-10-2019, 01:15 AM
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You have to ask yourself why you are adding it.

If you don't trust your local fuel source to have fuel available to battle cold temps, then yes using PS white bottle is going to help your truck.

If you are adding it because you want to add lubricity to your fuel, then there are better products for this if you believe this test.. (and yes I know it's over a decade old..) https://www.jatonkam35s.com/DeuceTec...itive_test.pdf

Personally, I have been running thousands of gallons of ULSD from the same fuel station, and the same pump, since ULSD was introduced in Alaska. I've had zero issues from any of my trucks, even those not built when ULSD was a thing. Never a drop of additive.
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