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Another Coolant Question? #4657423
02/05/18 09:49 PM
02/05/18 09:49 PM
Joined: Dec 2016
Posts: 2,163
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,163
VA
Somehow, I have ended up with a gallon of an Audi Coolant. Don't plan to use in any of my Honda.

It says, safe to use in Aluminum engines, but also list silicates in content.

Looking here: http://www.machinerylubrication.com/Read/841/coolant-fundamentals

Can some of these silicates present in European car coolants cause problems with Water pump, as well as seals and all?

If so, why does the bottle say safe to use in AL engines? shrug

Does anyone know if this coolant is going to be safe for AL engine or no?


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Another Coolant Question? [Re: maverickfhs] #4657433
02/05/18 10:11 PM
02/05/18 10:11 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
toronto
It would work meaning it has a suitable inhibitor chemistry for aluminum engines, but AFAIK the Japanese don't use any silicates in their coolants. Silicates can agglomerate into larger particles and fall out. Not personally a fan of silicate sand in my coolant, softly sandblasting impellers and abrading seals. The Japanese OEMs probably don't like that prospect either, and they only have the most reliable cooling systems around IMO. wink

Re: Another Coolant Question? [Re: maverickfhs] #4657435
02/05/18 10:13 PM
02/05/18 10:13 PM
Joined: Aug 2008
Posts: 3,167
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,167
USA
Silicates are a problem if the internal components weren't designed for them, or if the silicates fall out of suspension right?

But the amount of silicates present in a modern coolant would be drastically less than in the old school formulas. A HOAT coolant like Zerex G05 is going to have some silicates, some organic acids.

So worst case -- if you use the coolant, change it out after 3 years/36k miles.

Re: Another Coolant Question? [Re: maverickfhs] #4657915
02/06/18 12:47 PM
02/06/18 12:47 PM
Joined: Dec 2006
Posts: 7,655
Toronto, Canada
KrisZ Offline
KrisZ  Offline
Joined: Dec 2006
Posts: 7,655
Toronto, Canada
Not a problem. There was some concern with water pump life with the old, fully silicated formulas, but it's nothing like "sandblasting" any internal components. Another internet myth that just won't die. Japanese mostly avoid silicated because of their local water supply, which is I think soft water, so they use phosphates. In Europe they have very hard water and silicated formula works better in that scenario.

Reality is that today's low silicate formulas have no bearing on cooling component life what so ever.


2015 Dodge Grand Caravan-27k miles.
2006 Mazda 3-163k miles
Re: Another Coolant Question? [Re: KrisZ] #4657994
02/06/18 02:02 PM
02/06/18 02:02 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
toronto
Originally Posted By: KrisZ

Reality is that today's low silicate formulas have no bearing on cooling component life what so ever.

Low-silicate is better to alleviate the problem of dropout and abrasion, but it's just that- low silicate, not no-silicate. The presence of silicates doesn't automatically mean system failure, but the means of dropping out and becoming circulating abrasives well remains and that's still a difference. Silicates are obsolete IMO!

Re: Another Coolant Question? [Re: PeterPolyol] #4658024
02/06/18 02:29 PM
02/06/18 02:29 PM
Joined: Dec 2006
Posts: 7,655
Toronto, Canada
KrisZ Offline
KrisZ  Offline
Joined: Dec 2006
Posts: 7,655
Toronto, Canada
That's why you change the coolant. If you want to go 10 years between coolant changes, then I agree, you have to drop silicates, but if you're fine doing it every 5 years, silicates pose no problems and will not drop out.

I've been running G-05 in my Mazda 3 for close to 10 years now. No problems as long as no mixing with other formulas is allowed and the coolant is changed per recommendation.


2015 Dodge Grand Caravan-27k miles.
2006 Mazda 3-163k miles
Re: Another Coolant Question? [Re: maverickfhs] #4658028
02/06/18 02:31 PM
02/06/18 02:31 PM
Joined: Dec 2016
Posts: 2,163
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,163
VA
I guess, Audi coolant is same as G-05 so thanks for answering the question.


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT

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