uraniummetallurgist

Hi All:
I have a coolant leak most likely in the radiator expansion tank plumbing and am awaiting parts to repair that thanks to the US Postal Service were sent to England rather than to my address. But I digress.

I assume that once the wayward parts arrive I'll get them in and will need to top off the coolant. I was wondering if there are any preferences as far as anti freeze. There are many choices off the shelf at the local auto parts stores and many are recommended for aluminum block.

Any advice or recommendations?

Thanks in advance!


Joe

GeorgeM

I believe the prevailing choice here is Zerex G-05 or equivalent. That's what I use.

mike77

I use G48 which is Porsche approved for cars upto 1995. It's blue

Donald Smith

I have been using Dexcool, by Prestone, picked up at Cdn Tire outlets.

bureau13

I use Zerex G05. Dexcool got a bad reputation for turning to jelly when mixed with the green stuff (I think that was the alleged cause) and I believe there was a lawsuit. I use it in my H3 because it specifies that and it's never had anything else, but not the 928. If you're using it, I would make sure you flush it thoroughly if you decide to change to something else.

beran earms

This was a question I was going to ask today as well. I hope there is more input . Also is it wise to flush the system anyhow or is that unnecessary?

wpgshark

I use Volvo coolant. I use it in my Volvos which are the winter cars so easy enough to use it in the Porsches.

Things I like.
Leaves a white trail where it leaks and evaporates, easier to find small leaks.
Dark blue, easier to see in the expansion tank and easier to find leak puddles.
Every time I dump it 2-3 years it still looks new. Which considering the Volvos are turbos and run hard in heat and operate to -40 in our climate is pretty cool, pun intended
Any engine I've taken apart has never had any pitting or other coolant related issues.

A couple of extra bucks every couple of years really doesn't make a difference.

WyattsRide

+928 This is what I use also as recommended by my local 928 expert.

I would think a flush would be recommended if the fluid hasn't be changed in a while or the fluid is unknown. Not necessary if the coolant has been changed regularly with the correct one.

mike77

"Dexcool got a bad reputation for turning to jelly when mixed with the green stuff"

I was going to say, best not to mix coolants incase they react. Perhaps find out what colour is in there already and then make an educated guess about what has been used previously and stick with it. Also do a good flush with water to be sure.

GlenL

I'm a simple man and use the Dexcool. Perhaps it's the color. In any case, it's on the shelf at the friendly, local auto parts store and says "Dexcool" in big letters on the front.
The mixing issue was years ago and I understand it was reformulated. In any case, I put that and only that in my aluminum-blocked P-cars.

LexVan

Porsche coolant from Sunset Porsche. Or, if you want to save a little $, buy Audi or VW's.

Use distilled water, though, for the right ratio.

davek9

I've had great results w/ this mix

MainePorsche

I use the Xerex G05 and distilled water.
Sean R had once posted a comment that he found the Water Wetter left a blackish residue in some systems he worked on. I haven't heard anything else on this since. I still have my bottles on the shelf.

As to flushing it out I don't recall a specific discussion on it, but I do recall comments on old coolants becoming acidic if left to long causing damage to the head gasket. I recirculate the old out and new in once a driving season as a rule.

linderpat

As others have said, Zerex G-05. Also, if you do not know what was in there previously, do a full and thorough flush. Some coolants act badly over time when mixed with others.

WyattsRide

^^^ My local 928 expert