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Old 02-21-2020, 08:04 AM   #1
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Diesel anti-gel

I've been RVing for many years in a gas MH. We just purchased our first diesel pusher and am wondering about diesel fuel and low temps.

At what temperature should I be concerned with the fuel possibly clouding/gelling and plugging the fuel filters? I know in winter months stations usually have fuel that's been "winterized", but I know there will be fuel in the coach tank from summer months too.

So, what product to use and at what temps?

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David
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Old 02-21-2020, 08:27 AM   #2
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Diesel anti-gel

I add this when temps will be below 40 F

It is an excellent cold weather anti-gel in addition to its other properties. Saw a review/test on YouTube channel project farm where it beat out many other competing products in cold weather performance.

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Old 02-21-2020, 09:21 AM   #3
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Around 20 and below is where you might see significant paraffin start to form

If you are going to colder weather try to fuel in that area as the fuel will be treated

If you are in a warmer area and have a significant cold front and need to drive then think about adding your choice product

Most fuel is treated late fall to early spring in colder areas and will be noted on the pumps
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Old 02-21-2020, 10:43 AM   #4
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Untreated #2 diesel fuel starts to gel at 17 degrees F. Most fuel locations start selling treated fuel around November ask if their fuel is treated or not.
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Old 02-21-2020, 10:55 AM   #5
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We have been taking our diesel coach to the mountains to take us to snow skiing areas for the past 20 years now, and I haven't used any supplements for the diesel. Temperatures routinely drop into the teens and lower.
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Old 02-21-2020, 11:04 AM   #6
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With standard #2 diesel good down to about 20 (or the 17 F cited above), I'd say to be cautious once daily temperatures get to the low 30's. But if you live and travel in that climate, the diesel fuel at the pumps will almost surely be a winter blend and dependable at much lower temps, typically well below 0 F. The only concern might be driving to a wintry climate while your fuel tank is still full of summer-blend fuel or your last fill-up was in a warm climate.
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Old 02-21-2020, 11:11 AM   #7
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Here's a map from T/A showing regions where and when they use winterized diesel. It's just that, a map from T/A, but it might help you understand where in the country winter blend fuels are normally supplied.

https://assets1.csnews.com/files/sty...?itok=GYqWLUBe

If in doubt, and if you expect temps to drop below 20F, then by all means add an anti-gel agent.
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Old 02-21-2020, 11:18 AM   #8
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I use Howe’s in my truck once the temps are staying below 20°, probably more for peace of mind than anything else.
As suggested, Snowbirds coming back from the South have to be aware of the weather, not only for the possibility of their diesel gelling up, but also for the necessity of winterizing their water system.
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Old 02-21-2020, 12:52 PM   #9
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Thanks for all the replies!
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