Coolant and yes I have searched and read

[Pdwight]

Still I did not see any definite conclusions to the OEM Porsche OAT coolant. Is there a substitute OAT that equals the original (and upgraded) Porsche coolant ?

I know Porsche does not manufacture coolant so what are you guys using ??

[JayG]

Porsche coolant

[Nine8Six]

Porsche coolant

And changing/flushing it every 36 months ('97, original water pump and coolant tank)

[Smallblock454]

I use the coolant Porsche uses OEM, but don't buy it from Porsche.

Regards, Markus

[Deserion]

VW/Audi G12 (pink) or G12+ (purple).

[Timco]

Pentofrost. Done.

[Gelbster]

Originally Posted by Pdwight

Still I did not see any definite conclusions to the OEM Porsche OAT coolant. Is there a substitute OAT that equals the original (and upgraded) Porsche coolant ?

I know Porsche does not manufacture coolant so what are you guys using ??

Pedro has a great diy
Flush Coolant System Porsche DIY
and all about OAT & HOAT coolant"
http://www.pedrosgarage.com/Site_5/Coolant_Antifreeze.html
Plenty of OAT choices here:
http://www.oreillyauto.com/site/c/search.oap?keyword=antifreeze

[Heiko]

Ravenol or Vaico G13 works as well (that's pretty much all I run in mine... flush once every 3 years)

VW Antifreeze - VW G13 G12 Antifreeze - Pink Purple VW Antifreeze

[dghii]

Man, i debated this thing with myself years ago...I felt like a complete dumbaz considering coolant at $30 a gallon at 90K on the clock.
At the end of the day, the best alternative I found was a Zerex extended life was about $18/gallon.

At the end of the day, I figured that this was not worth it (to me) to second guess the decision to spend an extra $36 on the P-brand. I figured I may never have to do this again (if I sold the car at some point).

[Smallblock454]

Hm, OK - does everybody know what OAT means and why Porsche used it?

So if you are using a different non Porsche, non OAT cooling fluid, make shure you change it frequently at min. every 5 years.

Regards, Markus

[mikefocke]

Organic acid technology

wikipedia is a good place to start.

[Pdwight]

This sums it up better than I have seen it in one place before

[BrokenLinkage]

OK I'll bite:
@ Markus
1) why did Porsche use O.A.T.?
2) where did you get the equivalent-to-Porsche-brand fluid? Is there a compatible and comparable alternative to purchasing fluid from the dealer?
Thx

[Lew]

Pentosin's PENTOFROST. It's label states it's for VW's, Audi's, and Porsche's.....and all aluminum engines.....

[jakeru]

The current coolant Porsche is selling for our cars is not OAT.

As proof, note the word "silicates" appearing on the ingredient list of Porsche's most updated/current coolant...

The part numbers of this particular jug are: 000 043 301 49 on the back, and "G-40-91-EF" on the front:

[Deserion]

Looks like this could be the type (Porsche approval):
G40® | Glysantin®

So it's a silicated-OAT, then (also considered a HOAT).

Per Glysantin, G40 is used from 2010 onward, G30 from 1996-2010, and G48 up through 1995.
http://www.glysantin.de/fileadmin/Files/Downloads/Publications/BASF_Glysantin_Zulassungen_EN.pdf

[Quadcammer]

https://www.walmart.com/ip/Peak-Global-Lifetime-Anti-Freeze-6ct/17201158?wmlspartner=wlpa&selectedSellerId=1122&adid=22222222227010052247&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=c&wl3=150343663857&wl4=pla-261227233139&wl5=21164&wl6=&wl7=&wl8=&wl9=pla&wl10=101593696&wl11=online&wl12=17201158&wl13=&veh=sem#about-item

works fine. Don't overcomplicate it, the porsche stuff is nothing special.

[Gelbster]

Lots of OAT brands to choose from. See Post 7 above.

[Smallblock454]

I'll get it from BASF. See post #16 from Deserion.

It's G30 (OAT) for the 986. Why? Because it's an alloy engine. And because it has a very long change interval (very good long term stability) compared to other fluids.

In general it seems you can also use G40 (Si-OAT). But you have to flush the system completely.

Don't mix silicat free coolant fluid like G30 with silicat containing coolant fluid like G40.

I don't know how the parts in the 986 cooling system react on the silicat. Don't know if Si-OAT is 100% compatible with the 986 coolant system on a long term.

In general silicat reacts with alloy and generates a protective layer. But this layer doesn't last very long. So they developed the OAT coolant fluid. The long term alloy corrosion protection is much better.

This is why i would recommend to use BASF G30 for a 986 car.

The bottle jakeru shows is the newer G40 stuff.

Regards, Markus

[JayG]

Just use Porsche coolant and you don't have to worry about all this BS