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The only time I've needed fuel additives is on a couple of large capacity V-Twin carbureted motorcycles, where you can get a phenomenon called "Carb Icing" where the atmospheric moisture freezes onto the carb jets and blocks the fuel flow. This means that when you shut the throttle after a period of running the carb blocks and all the cylinders it feeds die. Very annoying and a little dangerous, but not a real problem.
"Normal" petrol (or Gas) freezes at -60C (-76F) so you will have bigger problems than your car if it gets that low ... Diesel freezes at around -8C (17 °F) so that may be a problem.
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I haven't had any problem with any car (diesel or petrol) by temperatures below -10°C without additives in fuel.
Battery chargers and water for the wipers is another story, though.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
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The key ingredient in Heet is isopropanol, when added to water, it lowers the freezing point of the water. [linky[^]] Seafoam also has isopropanol as an ingredient although not in as high as a concentration so the freezing point would not be as low unless you add more. Contrary to what the other posters above had stated, putting Seafoam in the gas tank is one of the intended use cases for Seafoam [linky[^]]. I have done this successfully as part of the maintenance routine on the recommendation of my mechanic who is ASA certified as part of my winterization routine. I have not had any issues starting my vehicle for years. Today it is -15 for my drive into work, brrr.
The gasoline in your tank isn't going to freeze. The water that hasn't mixed with it, might. And if it freezes and plugs a fuel line or filter, then yeah, you'll have problems. If the gas in your state has ethanol in it (don't most, nowdays?), then the heet isn't even needed as any water already mixed with the ethanol in the gas and passed through the system long ago.
Now, if you were talking diesel, then its a different story.. and heet isn't the right solution there.
Seems the one effective way of de-icing the windshield is to...
Start the car
Turn the defroster onto blast-o-max-o
Wait a long time
I always just used an ice scraper. That's what the things are for. Every filling station and grocery store sells them. Auto parts stores too, if you're really having trouble finding one. Heck, even Target sells them (and even in places that almost never need them, too).
As for windshield wiper fluid freezing, yeah, -30 is darn cold. You could try adding HEET to it , but truthfully, at -30 you probably don't want to be squirting any liquid on your windshield anyway.
Also, at those kinds of temps, you gotta start worrying about the antifreeze in the engine. As I recall, it isn't typically mixed to sustain such low temps.
About the only time I travelled "up north" on a regular basis, two of my boys were involved in travel ice hockey. Most of the time, the weather was bearable - cold but sunny, temps around 10-25. There were a few trips my wife took to Sarnia at the south end of Lake Huron. Amazing amounts of snow piled up by the plows - 30+ feet.
One thing we noticed - seemed the cars up north warm up faster and put out more heat. The other thing - people actually put their cars in garages (those that have them).
Last week it was 75 here in Atlanta. Nope, not moving north
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
Many years ago (like, around 1980) I read a philosophical dissertation about the concept of holes, being the defined by the abscence of "something", their existence defined by something outside themselves which is definitely not part of the hole, yet that which defines it...
You might think that this is a trivial matter, but this dissertation showed that it is certainly not.
My problem is that I have lost my copy. At least, I am unable to find it in my half a ton of old xerox copies in the basement. Does the issue ring a bell? Can anyone help me to a link, or even a reference to a paper copy of this dissertation?
(As far as I remember, my copy was a xerox of a friend's xerox, so without the copy at hand I cannot give any hint about the source.)
I recall some science papers and tangental philosophies that were based on a reversion of Einstein's problematic "hole argument" when he was working on general relativity.
If I recall correctly, it comes down the simple fact that a "hole" in something is simply a 3D object, and that object is within another object... so if know that parent object we know about the children within, so we can determine what the hole is or is not.
But I don't have a copy of that, just some term papers I did on Einstein back in school
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