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Diesel: pump premium or additive? #4571738
11/12/17 11:34 AM
11/12/17 11:34 AM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Having recently acquired my first diesel car ('82 Mercedes in sig) I intend to run premium diesel as often as practical, especially since its daily routine will be a majority of in-town trips with one or two 20-50 miles runs a week. However, I see several fuel additives that advertise making premium diesel out of no. 2. Is there truth to these claims or is it more hype like octane booster for gasoline?


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Diesel: pump premium or additive? [Re: Alex_V] #4571760
11/12/17 12:07 PM
11/12/17 12:07 PM
Joined: Oct 2009
Posts: 3,694
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,694
Wet side WA
I use this to clean the injectors and to lube the fuel pump. As for actual does it make it premium diesel couldn't prove it by me.
$15.95 at Walmart the cheapest source I've found.



Last edited by JohnnyJohnson; 11/12/17 12:08 PM.

2004 Corolla 128276
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74615
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: Diesel: pump premium or additive? [Re: Alex_V] #4571816
11/12/17 01:23 PM
11/12/17 01:23 PM
Joined: Sep 2010
Posts: 7,597
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,597
Planet Earth
Most of the modern diesel additives (Stanadyne, Diesel Kleen, or Howe's to name a few) usually have a cetane booster built into them. The questions I think you will have difficulty answering are how much they raise cetane and what is the starting cetane of the diesel before adding it. From my point of view, I add one the aforementioned to control water so I am less concerned about cetane than I am about fuel system health.

Re: Diesel: pump premium or additive? [Re: Alex_V] #4571832
11/12/17 01:36 PM
11/12/17 01:36 PM
Joined: Jan 2008
Posts: 521
Richmond, BC, Canada
mechjames Offline
mechjames  Offline
Joined: Jan 2008
Posts: 521
Richmond, BC, Canada
Premium diesel at the pump is regular diesel and the pump adds the additive. I once bought premium diesel but the additive dispenser was empty so got regular diesel but paid for premium diesel.

So i no longer bought premium diesel at the pump and I just started adding diesel kleen / stanadyne peformance formula to my fuel myself so it's consistant.


86 Mustang 5.0L 170km - Amsoil XL 5w30 / Baldwin B2-HPG
14 Ram 1500 5.7 - Amsoil XL 5w20 / Baldwin B7443
98 Jeep ZJ 5.9 - Amsoil OE 10w30 / Baldwin B34
Re: Diesel: pump premium or additive? [Re: Alex_V] #4571853
11/12/17 02:00 PM
11/12/17 02:00 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Good info. I used a whole small bottle of Diesel Kleen in the tank on my 450-mile drive home with the car a few weeks ago, haven't put anything through the tank since. From reading about the differences between No. 2 and premium diesel I suspected that it was pretty much the same as adding it before fueling up, just wanted to be more sure. I'm partial to Schaeffer's products (have their full syn 5w40 in the sump right now) and I believe one of their products has a soy component and purports to boost diesel to premium specs so I'll give it a try as well as the Stanadyne stuff.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Diesel: pump premium or additive? [Re: Alex_V] #4571868
11/12/17 02:12 PM
11/12/17 02:12 PM
Joined: Sep 2008
Posts: 2,017
Pennsylvania
Boomer Offline
Boomer  Offline
Joined: Sep 2008
Posts: 2,017
Pennsylvania
I have used Diesel Kleen for almost 5 years in my VW diesel car. (See signature) The car has run flawlessly over that time. PA also requires the addition of 2% biodiesel into diesel fuel all over the state and that also really helps with lubricity.


2013 VW Passat TDI SE, 61,200 miles Castrol Professional VW507 5W-30
2017 VW Golf All Track 18,370 miles Castrol Professional VW505 5W-40
Re: Diesel: pump premium or additive? [Re: Alex_V] #4572125
11/12/17 06:38 PM
11/12/17 06:38 PM
Joined: Jan 2017
Posts: 207
Michigan
64bawagon Offline
64bawagon  Offline
Joined: Jan 2017
Posts: 207
Michigan
I think your getting caught up in terminology and marketing hype. "premium" could mean a lot of things with diesels. I think some places just call theirs premium for marketing. My understanding is that diesel in the U.S. is mixed with additives at the local level (jobber or distributor) and then delivered. The standards for anti gel and additives are pretty loose and not really monitored. There was a study I read recently (cant recall where that sampled a bunch of sellers and found many to not be treating their fuel properly in cold weather) I try to buy from reputable places with decent turnover but have still gotten bad fuel a couple of times over the last 12 yrs, the last one was at a national chain thats name starts with an S and rhymes with peedway, that resulted in a tow bill since it was below zero when it froze up.
I run Power service white bottle or Howes in my truck year round.


64 Chevy wagon, 10 Jeep Wrangler, 18 Silverado 1/2 ton
Re: Diesel: pump premium or additive? [Re: Alex_V] #4572126
11/12/17 06:38 PM
11/12/17 06:38 PM
Joined: Apr 2017
Posts: 515
Fort Worth TX
TheKracken Offline
TheKracken  Offline
Joined: Apr 2017
Posts: 515
Fort Worth TX
Have you thought about using TCW-3? Works well in gas engines and I am pretty sure people use it in diesel's as well.


2011 Prius 96k miles RLI 5w20
97 Toy T100 4x4: amsoil 0w20 242k Miles
04 Toy Sienna awd: Pennzoil 0w20 281k Miles
Re: Diesel: pump premium or additive? [Re: Alex_V] #4572131
11/12/17 06:40 PM
11/12/17 06:40 PM
Joined: Mar 2004
Posts: 21,350
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,350
Upstate NY
I have yet to see premium diesel. Does your vehicle have a mechanical injector pump. If so consider 1oz of TC-W3 oil per gallon of diesel. In did that in my Cummins diesel.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Diesel: pump premium or additive? [Re: Alex_V] #4572219
11/12/17 07:55 PM
11/12/17 07:55 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Yes, it's an inline, mechanical Bosch pump. I'm assuming TCW-3 is cheaper to add than a fuel treatment like Power Service, etc.? So, maybe, run TCW-3 in warmer weather and something like Power Service when temps will be much below freezing, with a shot of a more aggressive cleaner (Diesel Kleen?) every 3-5,000 miles?


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Diesel: pump premium or additive? [Re: Alex_V] #4572410
11/13/17 06:18 AM
11/13/17 06:18 AM
Joined: Sep 2010
Posts: 7,597
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,597
Planet Earth
I have seen posts in various diesel forums about adding TCW-3 oil to a tank of fuel to increase lubricity and the claims about how much it helps. I have also seen posts claiming just the opposite and how it can harm the DPF over the long term. Though situated in South Africa, this 2-Stroke Oil In Diesel A Technical Study seems to be very straightforward and analytical in its approach and gives some good insight into the lubricity of two-stroke oil in diesel fuel.


Re: Diesel: pump premium or additive? [Re: Alex_V] #4572424
11/13/17 06:54 AM
11/13/17 06:54 AM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline OP
Alex_V  Offline OP
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Yes, right after my last post I did some more reading on TCW3 and I think I'll feel better about just landing on one additive to use all the time without the potential drawbacks. Schaeffer's SoyShield looks like a good option - everybody says a bio component in diesel is a good thing, and if bought by the gallon and used at the recommended concentration it ups my fuel cost approx. $.07/gal.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Diesel: pump premium or additive? [Re: Alex_V] #4585095
11/26/17 01:11 AM
11/26/17 01:11 AM
Joined: Sep 2002
Posts: 313
Jefferson, Wisconsin
Intelman34 Offline
Intelman34  Offline
Joined: Sep 2002
Posts: 313
Jefferson, Wisconsin
I always run the premium/gold diesel product from Kwik Trip. It's 5 cents per gallon more, but I see less smoke in my modified LBZ Duramax. It's about the same in my other two diesels. All three vehicles still get a light treatment of Alliant Power Ultraguard in every tank.


2007 GMC Sierra 3500 Classic - LBZ Duramax - 68mm Turbo & more
2018 Chevy Equinox AWD - 1.6L Diesel
2015 Chevy Cruze - 2.0L Diesel - Trifecta Tuned

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