vanster

Of all the different coolants out there, what do most use?

jetson8859

Zerex G-05 in all four of mine

linderpat

Zerex G-05

hacker-pschorr

Mercedes coolant, which is re-labelled Valvoline Zerex G-05.

Mercedes has been making aluminum engines as long as Porsche.

I would use the Porsche coolant but I like that I can buy this locally at some auto parts stores.

928 GT R

Zerex G-05

Mixed 50-50 with distilled water.

Never - ever use tap water too obtain your 50-50 mix.

Taguid

I use the Audi/VW pink coolant.

SeanR

I stopped using G-05 a couple years ago and switched to the Porsche Red/ROWE coolant.

hlee96

Why? Does it leave more residue when you work on the cars through the years?

NoVector

This is really getting confusing... now there's G-40 for Mercedes and Porsche.

I'm thinking about trying this in the future, if for no other reason it has color. When I see a puddle under the car I always wonder if it's AC condensation or leaking G-05.

hacker-pschorr

Great.......it makes you wonder if this is really superior to previous coolants or some compromise to appease the environmental lobbyists.

I think the important rule's still apply. Change on regular intervals and don't mix different coolants. Aside from that, make sure whatever you are using is rated for aluminum engines.

928 GT R

Now Zerex comes up with G-40 for Porsche and Mercedes? We can get Pink, Green, Brown & Clear antifreeze... What happened to standardized colors for automotive fluids???

Why can we have multiple colors of anti-freeze but only one color of brake fluid? I miss super gold/blue, it made bleeding our brakes, clutch and PSD so much easier!

Sorry to go all off topic, but this is kind of crazy!

Chris Lockhart

Yeah I miss being able to easily flush the system with the ATE Gold/Blue as well. Made life a bunch simpler.

Has anyone tried this new G-40 Zerex?

hacker-pschorr

I cannot hep but ask what kind of results are you looking for? Unfortunately any negative reviews of a coolant won't be known for several years and even then, not until the engine is taken apart to see corrosion and the assumption it wouldn't have happened with a different coolant.

It's really a crap shoot at this point.

I did send an e-mail to Valvoline about this. I've received very quick and detailed responses from them in the past about motor oil so we shall see.

SeanR

Yes. About the only good thing about the G-05 I found was it left a nice residue in each spot it leaked. Which was a bitch to clean off.

davek9

Anyone found a good Coolant Tester that works w/ the OAT (G-05) coolants, most of them do not.
Would be looking for Freeze levels and Acidic test, now I just Flush and refill with the 50/50 mix.

Thanks!

Dave K