Getting the baby ready for the hot summer in the south. Changing thermostat(damns snap ring), coolant and putting lower temp switch in. Just wanted to know what the perfered coolant here on the list is. Some say dex-cool, some say the Benz stuff and some say the Bimmer stuff. Doing this to both my 84 and an 86 that I take care of.

 

It doesn't really matter which brand. Just make sure it's phosphate free to be friendly to your aluminium!. Usually comes in a poofy pink colour.....

 

I was looking at a product called Evans NPG or NPG+. It's a waterless coolant. I've emailed them with some questions about their product and Porsche engines, but no reply yet. Here's a link: <a href="http://www.evanscooling.com/catalog/C_npg1.htm" target="_blank"> NPG Coolant</a> .

 

Would the dex-cool stuff be alright? It is a lot cheaper than the benz or bimmer stuff(pampers ain't cheap!!)

 

I think the dex-cool is OK (I think that is what I put in my car). As mentioned above, if it says phosphate free, then it is OK.

I also added some redline water wetter. Not real sure if this made much of a difference, but the car is running cooler since the change (this is the second coolant change since I have owned the car)

Be sure to have lots of rags on hand to burp the system - it can get messy. I had to hose the engine down after I was satisfied there was no more air in the system.

 

I saw gallon of Zerex phosphate free at the local Autozone selling for around 8 or 9 bucks.
(I paid almost 20- at the VW dealer!)

 

A lot of the Hot Rod crowd with small block, and especially big block engines, use Evans NPG+. I have not tried it yet, but hear from others that it works very well. Of course, it should for $25/gallon. They have tested NPG+ up to 500,000 miles and it does not degrade. This means that you never have to change it - it should be a one time purchase.

You use only Evans coolant - no water - and the whole cooling system runs at low or no pressure. This is supposed to lengthen the life of your cooling components, and cut down on leaks.

I might be trying it soon, and will report the results if I do. Its just a bit expensive to experiment with.

 

I use the Zerex G-05 Heavy Duty coolant, made by Valvoline. It's based on the same standard used by Mercedes for years, its phosphate free and ethylene glycol based (both Porsche owner's manual requirements), its available inexpensively at autozone, its backwards compatible with the old green stuff, its low silicate and low pH formula, etc. It's used in new DaimlerChrysler and Ford vehicles. I would avoid using Dex-cool as it isn't compatible with the typical green Prestone-type coolants and can cause sediments and deposits to form if mixed. Only GM seems to use DexCool.

Oh, and mix with distilled water.

 

i use dex cool. it is fine for our cars. i mean i use havoline which is the same as dex cool.

i like the red color. it matches my paint better than the green.

anything with dex in front is gm's private label.

dextron transmission fluid for example.

havoline is $8 a gallon at the local auto barn.

 

I use the Blue VW/Audi coolant

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by David Floyd:
<strong>I use the Blue VW/Audi coolant</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Same here, and actually going to pick some up today.

 

I had mine flushed and filled last year with pink phosphate free stuff. The shop buys it in bulk and he couldn't tell me what brand it was off-hand.

If I need to top it off, can I use any pink phosphate free, or is it important to find out exactly what he used?

Thanks.

 

I am running the pink Audi/VW (Autobahn) stuff in all my cars. No cooling problems thus far...

Regards,

 

I buy this stuff that is pre-mixed with distilled water. Just pour in.

A question....I have a tiny leak around a hose. It drips about 4 drops in 8 hours. I'm worried about the rubber below the leak, not so much about losing coolant.

I bought some coolant additive that is supposed to stop minor leaks with it's "beads" (or someting like that). It says it also lubs the waterpump and prevents rust. Problem is that it has to be put right in the rad and I went out to put it in and can't see the normal "rad cap". Do we have one? Would this stuff work if I put it in the expansion tank? Should I even be putting this stuff in my car?

944S Boyeee

 

Ehhh. I probably wouldn't. I don't trust additives such as this...the idea of putting something into the fuel system which 'stops' leaks...I have feelings they may gunk up the system over time or cause problems in the pump after a while.
I always feel stop-leak products are for cars with inexpensive parts...with my Porsche, I wouldn't feel comfortable running hat fluid. Especially with such an expensive pump.