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By hlee96
#73324
Sorry if this opens a whole can of worms, but I am about to have Stan (@MrMerlin) help me get my '78 #414 going next week (mostly electrical stuff/fuel pump), and I want to get the correct coolant in there so I can dump my reserve of Zerex G-05 away after reading the Rennlist threads. The car received new Laso plastic impeller pump with new screw set, Gates belt, and new tensioner rollers.

So, I gathered from the 21 pages (ongoing...) that Dave (@worf928) recommends Prestone Extended Life. (https://prestone.com/products/?detail=AF2000)
1. Can I assume that the correct Prestone is the "TEAL" colored one that is specifically for "Porsche older than 1999"?

GB recommends Porsche coolant & Pentosin NF

Is this correct?

Thanks!
-Hoi
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By Erik N
#73337
What's wrong w/ G-05?
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By hlee96
#73360
I think Jim posted his experience with Zerex G-05 in this thread and subsequent pages of discussions showed that both Dave and Greg recommends against it and instead use Porsche/Pentosin NF or Prestone Extended Life (?color)
https://rennlist.com/forums/928-forum/1 ... rever.html
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By worf
#73410
This is a heavy edit of the original post.

Prestone Long Life is green. I’ve been using it for 20 years and I know from one engine tear down - in which that coolant sat for 14 years - that it works.

Otherwise, from the thread on TSTSNBN, and I’ll not argue about who recommended what:

Pentosin NF.

Or Prestone Long Life.

After much review of what I posted, the sources, and new information in the original thread on the other site, I cannot convince myself to recommend either G-40 or G-48.

Note that I also highly recommend flushing the heater core to get rid of as much G-05 (or other ‘unknown’ coolant) when switching. Pour into hose on output side of heater valve and direct the outflow from the ~1-inch overflow hose detached from the water bridge.

Furthermore, unless you know exactly what kind of coolant is in the car I would also do a distilled water flush before changing coolants.

The various flavors of "Violet"-colored coolant are not compatible with each other.
Last edited by worf on Sun Apr 18, 2021 5:37 pm, edited 3 times in total.
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By worf
#73413
hlee96 wrote: Thu Apr 15, 2021 7:25 am So, I gathered from the 21 pages (ongoing...) that Dave (@worf928) recommends Prestone Extended Life. (https://prestone.com/products/?detail=AF2000)
That’s it —^

I’ve no issue whatsoever with Pentosin NF. It’s just 3x the price of Prestone. But, the ‘14-year-sitting’ engine has data in my shop, the others do not.

Otherwise, I’ve switched to Pentosin Super DOT4 (*) for brakes and CHF 202 for PS/ATF fluid.

(*) DOT4 LV for modern Porsches with PSM. Non-LV for our ‘classics.’ (LV == low viscosity; required for these modern Porsches with their stability control trickery.)
Last edited by worf on Sun Apr 18, 2021 5:39 pm, edited 1 time in total.
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By Majestic Moose
#73740
My anecdotal evidence is the engine from my 1989 that had very minimal maintenance and was still fitted with the original water pump and timing belt. I know that it sat for over five years before my ownership. It was filled with green coolant that was clean as could be. The cylinder heads are nearly perfect. Green coolant will go back in with changes every three years.
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By worf
#73742
I read the posted-the-other-day 20-page pdf translation from the Russian website that “explains everything.”

It made my head hurt. I’ll probably have to read it two or three more times to make any sense of it.

I note that everyone in that thread seems to equate Prestone Long Life coolant with the original 60, 70, 80s coolant and they use both Prestone and ‘Green’ almost as pejoratives.
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By Charlie
#73841
That thread was 20 minutes I'll never have back. The Russian link was almost as hard to follow as the rest of the thread and probably had even less real information. Plus we all probably have some new malware now.
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By worf
#73860
Charlie wrote: Sat Apr 17, 2021 9:43 pm The Russian link was almost as hard to follow as the rest of the thread and probably had even less real information. Plus we all probably have some new malware now.
Oh I sure as Hell wasn't going to click that link. I read the PDF Rob Edwards posted.
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By Charlie
#73903
I took a few precautions so I doubt I got any eastern European virus variants. But if you're out of beautiful female GRU agents that certainly would be an effective net.

On the main topic: My heads before rehab were among the worst that ever appeared on R-list. So my coolant is Dave's coolant. It's cheap, easily available, and is the 'green' standards. Sometimes the easiest is also the best.
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By worf
#73930
Charlie wrote: Sun Apr 18, 2021 11:21 am But if you're out of beautiful female GRU agents that certainly would be an effective net.
Google is uncharacteristically unhelpful with an effective response. I’ll have to leave this Onnatop:

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By Charlie
#73944
And they're off...

928 derangement syndrome: My thoughts went immediately to the outfit - worthy of an upholstery thread.

I was thinking more old school: Tatiana Romanova, GRU agent who fakes a defection to embarrass the British Secret Service and subvert 928 threads.
Attachments
amsoil coolant bond.jpg
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By worf
#73955
Charlie wrote: Sun Apr 18, 2021 2:10 pm ... embarrass the British Secret Service and subvert 928 threads.
Yup. A remarkable ability to subvert 928 threads.

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By worf
#73981
BACK ON TOPIC:

I was worried that I'd 'mixed-up' G-40 and G-48. AND I may have. Stand by for more posts.

First a link to my post on TSTSNBN in which I pontificate at length about coolant:

https://rennlist.com/forums/928-forum/1 ... st16215552

SECOND:

G-48 is what you want to use not G-40. I've edited the first post.

Here's a picture made from https://www.glysantin.de/sites/default/ ... 1587037758

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By worf
#73993
Except...

G-48 is still low-silicate formulation.
G-40 is still a w/silicate formulation.

NF (as well as original factory fill) was a w/silicate formulation.

G-48 is recommended for our 'vintage' Porsches.
G-40 is not.

I am still of the opinion that we want a w/silicate formulation but am not willing to recommend a coolant that isn't specifically listed for our classic Porsches. Except for the Prestone Long Life.

Clear as mud. Sorry.
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By worf
#73995
I'll attempt to come back to this over the next few days and see if I can make more sense of the non-intersecting sets of information I have.
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By SwedeInSiam
#74040
Reading all this coolant threads I'm happy we don't have much choice here in Thailand since most people only pour water into the cooling system.

I'm using Castrol Radicool (the blue stuff) and it seams to work fine.

Here's how the WP impeller and housing looked like when I got the car. It had pure H2O in it.

Original Porsche WP with metal impeller.
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A bit hard to see on the picture but it had very deep pittings (several mm deep). Filled them up with epoxi and it's still good after 6 years.
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By checkmate1996
#74358
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