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#2122734 - 12/31/10 01:12 PM Re: Antigel Temperature [Re: Oldwolf]
bullwinkle Offline


Registered: 10/09/04
Posts: 3891
Loc: Cincinnati, OH, USA
Keep a bottle of Diesel 911 around as well, good stuff for drying out watery fuel. If your '93 is like my '82 300D, there is no heater on the fuel filter. I also try to keep all diesel tanks as full as possible, especially in winter, to cut down on condensation. Mac's Antigel is also available at NAPA, I have a gallon in the basement that I got on sale, fortunately haven't had to use it!
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#2122738 - 12/31/10 01:18 PM Re: Antigel Temperature [Re: Oldwolf]
Points Offline


Registered: 06/04/03
Posts: 46
Loc: MN
I had a VW jetta TDI for many years and I used a qt of e85 gas when the temps are below -10 here in mn.
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#2123175 - 12/31/10 08:08 PM Re: Antigel Temperature [Re: Points]
BobFout Offline


Registered: 03/23/09
Posts: 2682
Loc: Indiana
Originally Posted By: Points
I had a VW jetta TDI for many years and I used a qt of e85 gas when the temps are below -10 here in mn.


Gas in a TDI (or any modern diesel)? crzy

Gas in old diesels can be OK per the manual, but never in a modern diesel.
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2003 VW Jetta TDI, tons o' mods with turbo upgrade. Red Line 0w40.
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#2127979 - 01/05/11 08:25 AM Re: Antigel Temperature [Re: bullwinkle]
Oldwolf Offline


Registered: 09/22/05
Posts: 993
Loc: Cary, NC
Originally Posted By: bullwinkle
If your '93 is like my '82 300D, there is no heater on the fuel filter. I also try to keep all diesel tanks as full as possible, especially in winter, to cut down on condensation.


I do have a fuel heater on my engine that is thermostatically controlled. At any rate, I am now adding 6 oz. of Diesel Kleen Anti Gel at every fill up. The winter here has been pretty mild so far though.

I usually fill up at about a quarter tank. I hear you about keeping the tank "fuller" to minimize condensation.
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#2128057 - 01/05/11 09:44 AM Re: Antigel Temperature [Re: Oldwolf]
scurvy Offline


Registered: 02/19/07
Posts: 2263
Loc: Chicago IL USA
Originally Posted By: Oldwolf
At what outdoor temperature should I use antigel in my diesel fuel?


That greatly depends on the quality of fuel you buy.

I keep a mason jar of untreated-by-me fuel from my local supplier of B11 in my unheated, uninsulated garage. It has remained bright, clear & completely liquid even at -28C [-17F]. I still tend to dose my fuel with Howes Diesel Treat or PS White once temps start straying down to -15C [low single digits F]. Never had a gelling problem or iced up fuel filter.

Especially with modern diesels, buying the highest quality fuel you can find is one key to long-term value.
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2006 VW Golf TDI - M1 TDT 5w40, MoS2, HU726/2x, EaBP90
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#2355664 - 08/23/11 07:51 PM Re: Antigel Temperature [Re: Oldwolf]
2cool Offline


Registered: 07/13/11
Posts: 410
Loc: Delaware
I use Howe's Diesel Treat. I can get it in all of the chain auto stores or any travel plaza serving trucks. I also use it in my heating oil, and my heating tech comments on how clean the system is at each annual service.

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#2785163 - 10/27/12 08:53 AM Re: Antigel Temperature [Re: Oldwolf]
TiredTrucker Offline


Registered: 01/04/08
Posts: 892
Loc: Kellogg, IA
Gelling is only one problem. Icing is another. You need to have an additive that tackles both. There is almost always traces of water in diesel. Usually not a problem. But when it is, it is a big one. I go thru around 21,000 gallons of diesel a year, so I can't afford to run into problems. But I am prepared. Over the years, I have grown fond of the Amsoil line of diesel fuel additives. Their Cold Flow Improver is pretty good. Recently, the son of a friend approached me about XLP Diesel Fuel additive. I dug around looking at specs for it online, and it is pretty close to the Amsoil stuff. It is made by an outfit in Olathe, KS under contract from Chevron for, if you can believe this, Amway! Price at application rate seems reasonable... 2/3 the cost of Amsoil line. I am going to be a guinea pig and test this stuff all this winter.

Since having my semi truck operational with low problems is critical in winter, I start putting additive in when we approach 32F. I get fuel from a variety of locations around the upper midwest, and even the top name outlets have occasionally had a load of fuel that didn't hold up well in cold temps. I don't play games and take chances. A gel up or other problem 700 miles from the house is not a good thing. I always carry spare fuel filters and additives.
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