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Question Of The Week

The Best Diesel Fuel Additives for RVs and Campers

But, if you read the various subjects on how fuels are formulated, you come away even more confused.  OEM provided owner’s manuals usually recommend not adding anything to fuel or oil, but of course they are in the business to sell vehicles.  Vehicle longevity claims are not always in their best interest, but they do sound nice in their advertising.

I’m a skeptic at heart, pessimistic most days and totally expect this response to be edited.  All the spelling, grammar and punctuation errors are mine.” – Mark Bench, 2015 Ford F350, 6.7 Liter Diesel, Shopping, but likely a Hallmark Everest or Alaskan.  Previous Lance owner.

“No additive.  I don’t see a need for it.” – John Rand, 1999 Ford F250, 7.3 Liter Diesel, 2012 Arctic Fox 990 and 2016 Northern Lite 9.6

“Power Serve.” – Peter Wood, 2006 Ford F350, 6.0 Liter Diesel, 2001 Bigfoot 3500

“I use E-ZOIL Diesel Aid+Cetane purchased from my truck repair company.  They repair large equipment.  The instructions say for maintenance to use 1 ounce per 15 gallons, and for performance to use 2 ounces per 15 gallons.  I always use 2 ounces.  I also have a programmer for the diesel recommended by my truck repair company.” – Chip Collin, 2002 Ford F350, 7.3 Liter International Diesel, 2014 Chalet DS116RB

“I do not use a fuel additive.  I do, however, make certain the fuel tank stays full in the winter and that the truck at least starts and runs once per week.” – Keith Kreutzer, 2005 Ram 3500, 5.9 Liter Cummins Diesel, 2005 Hallmark Guanella

“I use Diesel Kleen at about a half cup for my 20 gallon tank.” – John Cash, 1991 Ford F250, 7.3 Liter Diesel, 1998 Lance Squire

“Every six months or so there might be a sale on injection cleaner at a two for one price, so I will put in a bottle, but that’s it.” – Frank Niehus, 2007 Ford F350, 6.0 Liter Diesel, 2007 Arctic Fox 1150

“We have not used an additive.  We are new to having a diesel engine verses our gas one.  Next time we do an oil change, we will inquire at the dealership about using an additive.  It wasn’t mentioned to us when we bought it.  We were told to use pure diesel only and oil changes regularly.” – Hazel Green, 2015 Ford F350, 6.7 Liter Diesel, 2008 Northern Lite 10.2

“I use Hi Performance Lucas Upper Cylinder Lubricant.” – Billy Mackaill, 2014 GMC 2500, 6.6 Liter Duramax Diesel, 2016 Northstar Laredo

“Yes, but I’m not OCD about it!  I’ve talked with many diesel mechanics and have finally set my opinion that using a diesel fuel additive may or may not help your engine.  Why?  Think about it!

The main reason, as the oil company marketers claim, is that using a diesel additive will lubricate all of the moving parts within the diesel fuel system.  It also helps stabilize the fuel when your rig is in storage for long periods of time.  The additives coat the mechanical parts and, with this lubrication, prolong their life and allow these parts to function more efficiently.

Again I say, “think about this!”  Diesel fuel in and of itself is an oil.  Spill some on your garage floor, step on it, and you’re on your butt before you know what hit you.  So why add a lubricant to an oil?  It does not make any sense.  That’s one school of thought – don’t use any additives because you just don’t need them.

On the extreme other side of the school are the owners, not the mechanics, who would not fail to add 8 ounces of their favorite additive at every fill up.  That’s just a crazy waste of money.  So where I fall is, after every 1,000 miles, I add one bottle, 8 ounces, of my favorite additive to my tank.

My favorite being Opti-Lube XPD Formula Diesel Fuel Additive.  I buy it by the gallon and use some 8 ounce containers that I purchased early on.  I just refill them as I go.  This is a very cost effective way to cover the inconclusive data that swells around whether or not to use an additive.

Lastly, let me add that I know some diesel owners that have never used any additives and have with 200,000+ maintenance-free miles.  Go figure!  Happy trails.” – Dan Daddieco, 2015 Ram 3500, Cummins Turbo Diesel 6.7 Liter Diesel, 2015 Eagle Cap 1165

“I have never used an additive but, it does sit for four months during the winter.  I did not realize that algae will build up in diesel fuel.  It always starts up in the Spring and, I always have it serviced at Ford dealer where I bought it in the Spring.  They know it sits for the winter and have never suggested an additive.  Should I be using one?” – Steven Kafka, 2003 Ford F350, 6.0 Liter Diesel, 2005 Lance Max 981

“No.” – Bill Gage, 2003 Ram 2500, 5.9 Liter 24 valve Diesel, 2008 Northstar TC650

“Yes, I use Lucas Fuel Treatment with injector cleaner and fuel conditioner additive and have found that the regen comes on a lot less if I use the Lucas than if I don’t.  It gets a little better fuel mileage.” – Jerry Cunningham, 2010 Ford F450, 6.4 Liter Power Stroke Diesel, 2016 Host Mammoth

“I always use an additive.  I have used Amsoil, Power Service and Howe’s over the years.  There are several options depending on the seasons.  I also try to avoid the Minnesota veggie fuel if possible when we are staying in our general area.  I have never gelled up in the winter due to blending and additives.  That makes me happy!” – Dave Miller, 2015 Ford F350, 6.7 Liter Diesel, 2003 Bigfoot 10.6E

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