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Diesel Additive

Old 02-05-2021, 06:08 AM
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Default Diesel Additive

Do you all with diesels run additional additives? We did not in my fathers Duramax and I am not currently in my Cummins. However I have a friend who says I should be running fuel treatment in every tank.
Old 02-05-2021, 06:10 AM
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I used to regularly run Diesel Kleen with Cetane Boost in my BMW diesel. Could get it at my local auto parts store. Not sure it did anything for cleanliness but I had a tune and ran it primarily for the added cetane since my local stations did have the higher test stuff and my motor ran better at higher cetane levels.
Old 02-05-2021, 06:10 AM
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In my diesel F250 I run an additive when I remember to add it during a fill up. Haven't noticed a difference in mileage or how it runs. I will try and always add before a road trip or a long tow. The idea behind the cetane booster is the low sulfur diesel fuel we buy these days does not run as smooth due to a lack of cetane.
Old 02-05-2021, 06:27 AM
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Not at all necessary. Buy your fuel and DEF from a place that sells a large volume of both, and you will be good to go.

In your location the only thing I would do special (probably won't have an option anyway) is to fill up as soon as you return home following any trips to the south during the winter. Increased amounts of anti gel additive are added the further you shift north during the winter.
Old 02-05-2021, 06:34 AM
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Opti-Lube in both my trucks.
2007 Ram, 5.9 with 360k on the odometer.
2018 Ram, 6.7 with 27k on the odometer.
Old 02-05-2021, 07:55 AM
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I would not run a diesel without it if I planned to own it long term. These additives give your fuel lubricity, which it hasn't had since it dropped from 500ppm sulfur to just 15ppm...

If you keep it long term, the injectors and injection pump will last a lot longer with additive than they will without. It's a long term play that you won't notice if you plan to sell it in a few years. But, the next owner probably will.
Old 02-05-2021, 08:08 AM
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Good to know... I never have, but will do so for sure.
Old 02-05-2021, 09:51 AM
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When I use additive, Diesel Kleen with Cetane Boost is what I use to add additional lubrication for the fuel system. When I use it for a few tanks in a row, I seem to get a little better fuel mileage. I do forget to add it sometimes so it's not on every tankful.
Old 02-05-2021, 10:09 AM
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I run Stanadyne in my 6.4. I would keep a bottle of PS Diesel 911 around as well for winters. Especially with the cold temps we may get next week.
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Old 02-05-2021, 10:14 AM
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I don’t think it’s necessary. I buy my fuel from the same 2 places every time, one of which is a Quarles commercial fueling station

as long as there’s plenty of volume being pumped from there I don’t think an additive is necessary although I don’t think it will hurt either

On a side note, it’s a good idea to keep an extra fuel filter or two with you just in case
Old 02-05-2021, 10:26 AM
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I use Opti-Lube XPD in my Duramax truck and I notice a solid 1mpg increase and the engine definitely runs a little smoother and is more responsive. The onboard computer will show 15.X mpg average. If I switch back to anything else or no additive I will average 14.X or worse. Sounds crazy but it's true. When I run out of Opti I use the Hotshot EDT or Diesel Kleen, but can't say that I notice anything from it.

This is my day to day around town little bit of highway average, but is very consistent.
Old 02-05-2021, 01:16 PM
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I'm up and down with my mine with the Diesel Kleen. Some times I do, sometimes I don't. I try to do it in the summer when i know I'll be pulling my boat more. I'm not sure if it helps or hurts--its seems to idle higher? I dunno.
Old 02-05-2021, 05:04 PM
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Was told years ago by a very good diesel mechanic to put a quart of auto trans fluid in every so often when fueling up for lubrication.

I have 2006 duramax with 365k and no issues thus far
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Old 02-05-2021, 06:13 PM
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My 2005 Duramax has 279,000 trouble free miles on. I don't put anything in the tank but diesel fuel. I used to be a truck driver, we never put anything in the big rig except diesel either.
Old 02-05-2021, 07:09 PM
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I run Hot Shot's Secret EDT (Everyday Diesel Treatment). It adds lubricity and it's a cetane booster. Recently I've been filling up mostly at Quarles and all of the pumps are 47 cetane rated and they run through a lot of fuel so I feel less of a need for an additive but I still do it anyways out of habit. It's not that expensive and it's added insurance in my opinion. It might be snake oil but I think I've noticed a quieter idle and maybe slightly better fuel economy.
Old 02-05-2021, 07:14 PM
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Boat yes/Truck no
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Old 02-06-2021, 10:56 AM
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Originally Posted by SDS97_7.3 View Post
I run Stanadyne in my 6.4. I would keep a bottle of PS Diesel 911 around as well for winters. Especially with the cold temps we may get next week.
I put a little stanadyne in also
Old 02-08-2021, 03:53 PM
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When refineries make ULSD the process that removes Sulphur also removes most of the lubrication in diesel.
Lubrication is added at the refinery to ULSD .
Sometimes the injection system isn't working .
Tanker truck loads of ULSD can go out with no lubricity package.
Rare, but it happens.
22 years in big oil.
If I had a new pickup I would add lubrication, Stanadyne is a good choice.
Not sure about trans fluid, is it designed to burn in a combustion chamber and not leave deposits?
Old 02-08-2021, 04:42 PM
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I’m old enough to remember pouring trans fluid down a GM carburetor to clean carbon off pistons. So it will burn
Old 02-08-2021, 05:34 PM
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Originally Posted by cjdad View Post
Was told years ago by a very good diesel mechanic to put a quart of auto trans fluid in every so often when fueling up for lubrication.

I have 2006 duramax with 365k and no issues thus far
So do you do it?

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