Coolant and yes I have searched and read
 

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 ??

Porsche coolant

Porsche coolant

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

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

Regards, Markus

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

Pentofrost. Done.

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

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

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).

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

Organic acid technology

wikipedia is a good place to start.

Thanks Folks
 

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

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

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

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...http://986forum.com/forums/uploads02...1487221267.jpg

The part numbers of this particular jug are: 000 043 301 49 on the back, and "G-40-91-EF" on the front:
http://986forum.com/forums/uploads02...1487221295.jpg

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

https://www.walmart.com/ip/Peak-Global-Lifetime-Anti-Freeze-6ct/17201158?wmlspartner=wlpa&selectedSellerId=1122&ad id=22222222227010052247&wmlspartner=wmtlabs&wl0=&w l1=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.

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

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

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