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RV antifreeze

Old 11-03-2010, 08:34 AM
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Default RV antifreeze

I was strolling around home depot last night when I came across some RV antifreeze.Says on the bottle made by Dow,good to -50.Non tox same color pink as the stuff from the marine store.Except this stuff was 4.95 and the stuff at the marina is 7.50 a gal.
I would assume its just as good,What do you guys think.
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Old 11-03-2010, 08:39 AM
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Originally Posted by freeporttuna View Post
I was strolling around home depot last night when I came across some RV antifreeze.Says on the bottle made by Dow,good to -50.Non tox same color pink as the stuff from the marine store.Except this stuff was 4.95 and the stuff at the marina is 7.50 a gal.
I would assume its just as good,What do you guys think.
Propyline Glycol
Same stuff
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Old 11-03-2010, 09:34 AM
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Some have told me the purple stuff($7.50/Gal.)has more corrosion inhibitors and should be used in the motors.Pink is fine for water,toilet etc.Now BS......I don't know!
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Old 11-03-2010, 10:07 AM
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the purple is usually -100 the pink is usually -50...-50 is fine as long as you drain the raw water components (coolers, elbows etc.) in a FWC motor. in a RWC motor drain the block and manifolds as well.
as far as corrosion protection I am calling BS......
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Old 11-03-2010, 10:59 AM
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Originally Posted by CMEBoston View Post
Propyline Glycol
Same stuff
Yea,the #1 ingrediant was propyline glycol
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Old 11-03-2010, 02:03 PM
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Originally Posted by freeporttuna View Post
Yea,the #1 ingrediant was propyline glycol
I just bought three cases(18 bottles)-50 Pink at my local True Value for 2.75 each
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Old 11-03-2010, 02:10 PM
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Be careful what you use that stuff in, the -50 rating is burst rating not freeze temp, this means that it will still slush up and freeze at warmer temps than -50.
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Old 11-03-2010, 02:36 PM
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I flush with it,pull all impellers and let her drain.AC,Genny,Yanmars,Domestic water,eveything..
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Old 11-03-2010, 04:02 PM
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Originally Posted by blitzen View Post
Be careful what you use that stuff in, the -50 rating is burst rating not freeze temp, this means that it will still slush up and freeze at warmer temps than -50.
Agreed, but it hasn't gotten close to -50 around here.
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Old 11-03-2010, 11:34 PM
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I had a camper for 12 years and thought I did everything right to winterize all the water lines the 1st year I had it. Wrong..... Even with RV antifreeze run through all the lines I still ended up with split pvc(They use a cheap thin walled style) and a busted head valve. I replaced all the water lines with automotive heater hose and never had a problem again. Here's a tip for those with an RV and a head in your boat.....Remove the toilet fresh water fitting for the winter!
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Old 11-04-2010, 04:19 AM
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Originally Posted by hanson View Post
I just bought three cases(18 bottles)-50 Pink at my local True Value for 2.75 each

2.75 a gal.. damn..I gotta check wallmart.
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Old 11-04-2010, 05:06 AM
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Joe - Just keep in mind, that unless you are running an engine room heater (which I do), -50 rated is marginal for our area. -50 is the burst test rating for it in a thick wall cooper tube; it actually starts to freeze at +14F, the -60 stuff freezes at +7F and the -100 at -25F (it is all base on the percentage of PG in it (pure PG freezes at -120F, and is the stuff sold with a -200F rating not available in our area).
All polypropelene glycol is mixable, and mixing a higher rating with a lower raises the lower in proportion to the mixture - I mix 2 gal of -100 with 6 gals of -60 (which gets me to -4F (in theory, assuming zero water left in the systems)) for each of my diesel engines, and 1 -100 to every 4 gals of -60 for the water system and generator (OF). I coulld get away with just -60, but am concerned with residual water in the system, which will raise the freeze temperature some.
West has the -100 for $10, the -60 for $6, -50 for $5, and they have that if you spend $100, you get $20/off - needing (including my other boat) 6 gal of -100 and 24 of -60, it works out to about $8 each for the -100 and $5 for the -60.

Look carefully at what you buy - not all of the the -50F stuff (especially the cheap stuff at ACE) is just polypropelene glycol and water, which is what you want.
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Old 11-04-2010, 06:40 AM
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I'm a bit confused, which is normal for me, but if -50 AF starts freezing at +14 and most people I know run it through the motor without draining, which means it's mixing with water. I guess that would raise the freeze temp a few degrees.(maybe about to 20 degrees) How is it that we don't hear a bunch of horror stories each spring cause it does get that cold or colder in my area?
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Old 11-04-2010, 06:53 AM
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Originally Posted by nickmo View Post
I'm a bit confused, which is normal for me, but if -50 AF starts freezing at +14 and most people I know run it through the motor without draining, which means it's mixing with water. I guess that would raise the freeze temp a few degrees.(maybe about to 20 degrees) How is it that we don't hear a bunch of horror stories each spring cause it does get that cold or colder in my area?
I have been using the pink stuff to winterize my pool plumbing for 11 years, my current boats water system for 3 years and my RV's for 10 years 9although i now blow out the system). I have never had an issue here in NE where during this period we had some nearly minus 10 degree days.

Before pumping it through a block I would forst drain the water thats in there then flush.
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Old 11-04-2010, 08:58 AM
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Originally Posted by LI32 View Post
Joe - Just keep in mind, that unless you are running an engine room heater (which I do), -50 rated is marginal for our area. -50 is the burst test rating for it in a thick wall cooper tube; it actually starts to freeze at +14F, the -60 stuff freezes at +7F and the -100 at -25F (it is all base on the percentage of PG in it (pure PG freezes at -120F, and is the stuff sold with a -200F rating not available in our area).

If you would like 100% PG send me a PM and I can get it for you here in Providence.
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Old 11-04-2010, 09:06 AM
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Originally Posted by nickmo View Post
I'm a bit confused, which is normal for me, but if -50 AF starts freezing at +14 and most people I know run it through the motor without draining, which means it's mixing with water. I guess that would raise the freeze temp a few degrees.(maybe about to 20 degrees) How is it that we don't hear a bunch of horror stories each spring cause it does get that cold or colder in my area?
Several factors - PG doesn't expand as much as water; PG freezes in stages going from loose crystals at +14F to sno-cone slush at +5F to solid as a brick at -40F; the presence of water raises those thresholds a lot, espexially at the lower temperature ranges - a 10% dilution with water will raise -50F's hard freeze point by over 20 degrees; most water systems have flexible hoses that give some; and it is rare that it gets super cold where you are, especially near the shore - you see lots of freeze issues in the upper midwest.
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Old 11-04-2010, 10:04 AM
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7.50 a gallon is high - there usually are sales somewhere this time of year. I bought at Advance Auto at 3.99.
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Old 11-09-2010, 04:07 PM
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I can get it for hull truthers for $4 a gallon but you need to pickup in my new place in Portsmouth, RI
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Old 11-09-2010, 04:08 PM
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Also shrinkwrap for $9 foot if you bring your boat to me
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Old 11-09-2010, 04:44 PM
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Originally Posted by hanson View Post
I just bought three cases(18 bottles)-50 Pink at my local True Value for 2.75 each
I checked my local ace/true value store. It isn't PG and water. It's ethyl alcohol and water, and it is combustible.

It may be rated to -50, but it isn't the same thing that west marine sells for $4.99.

I wouldn't want to be running alcohol through my boats cooling system. Ethanol is bad enough in the fuel system.
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