Coolant Color

Kneale Brownson kneale at
Tue Jun 13 12:46:02 EDT 2006

That's different than the green stuff the original poster reported finding
in his car.  My understanding is that the orange extended life stuff should
only be used if you do a complete flush of all previous products from the
system.  Otherwise, it mixes with other types of antifreeze to form plugs.  

At 12:17 PM 6/13/2006 -0400, TooManyAudis at wrote:
>Did I miss something?  Doesn't your link say that the extended Life  Prestone 
>is Phosphate, Silicate and Borate Free?
>to wit:
>For those consumers who would feel more comfortable using a phosphate-free  
>antifreeze, our _Prestone®  Extended Life 5/150 Antifreeze/Coolant_ 
>(  is 
>silicate, and borate  free. 
>Where does it say that this formula contains small amounts of  phosphate?
>I'm curious.,, And I've run the extended life orange formula for years and  
>hundreds of thousands of miles.  Don't know if it will run 150k, but does  
>being replaced every 60k with the timing belt and waterpump.
>-- Tom
>91 200q 20v for sale (some disassembly and reassembly required)
>88 80q still going strong
>Message:  2
>Date: Tue, 13 Jun 2006 09:18:44 -0500
>From: "Doug Yoder"  <audifan at>
>Subject: Re: coolant color
>To:  brett at
>Cc: andy <trifox13 at>,  200q20v at
><c0ad9d350606130718p755ebb67x6845219433f9b0a9 at>
>Content-Type:  text/plain; charset=ISO-8859-1; format=flowed
>On 6/13/06, Brett Dikeman  <brett at> wrote:
>> > I just got the  car back from a timing belt/water pump/etc repair
>> > from a  reputable audi shop, non dealer, and the coolant is green. I
>> >  called them when I noticed and they said that this car doesn't
>> >  require the more expensive G12 and a quality aftermarket is what
>> >  they have always used. This includes the owners S4 w/ a 20V engine.
>>  > Any thoughts or comments?
>> Drain it and install the blue  stuff, and inform them that only
>> Pentosin is ACTUALLY phosphate and  silicate free.
>I usually read the "contents" section of the bottle  - *if* they bother to
>list it.  If they don't list contents, or if one  of the "ingredients" is a
>phosphate (hooray for chemistry!), I skip  it.
>It's not like you need to do it this second, day, week, or  even
>> month- but the "green stuff" is "low phosphate", even the stuff  that
>> claims to be phosphate FREE. If you don't believe me- check  out
>> Prestone's website where the slimeballs (pardon the pun) spin  a
>> wonderful tale about why they should be able to mis-label  "low"
>> phosphate coolant.
>Is this what you're talking  about?
>I have to admit, it's  a pretty amusing answer.
>Doug Yoder
>"Don't  tell me the sky's the limit - there's footprints on the  moon."
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