coolant question
Thread Starter
Joined: Dec 2007
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coolant question
https://www.amsoil.com/storefront/ant.aspx
Compatible With Other Fluids
AMSOIL Antifreeze & Coolant is dyed neutral yellow and is compatible with all ethylene and propylene antifreeze and coolant formulations on the market, including DEX-Cool®, Sierra® and Zerex®. It is also compatible with fully formulated diesel anti-freezes and other organic acid technology (OAT) and hybrid organic acid technology (HOAT) formulations.
I was always under the impression that if you were to switch colors you need to replace the hoses and flush out all the remaining coolant. Now amsoil seems to be saying that you can mix it. ????????????
any ideas here?
Veteran
Joined: Jan 2008
Posts: 360
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From: Bowling Green, KY
RE: coolant question
Found via google:
There is also this huge myth that you cannot mix different colors of coolants. This is utterly false.
Once again, the color of the coolant has absolutely no bearing on it's composition. You can mix them all you like and you will not damage your engine or radiator. The only warning is that if you mix more than 10% silicate-type coolant with an organic-type coolant, you must follow the replacement schedule of the silicate-type coolant i.e. you don't get the long-life benefit of the organic coolant.
The mixing problem only arises from mixing a chromate-containing propylene glycol (PG) coolant with any ethylene glycol (EG) coolant. You end up with a chromate hydroxyl sludge that will clog radiators and engine passages. But AFAIK, only two companies currently sell PG based coolants: Sierra and AMSOIL. PG is slightly less toxic than EG, but does not cool quite as well.
There is also this huge myth that you cannot mix different colors of coolants. This is utterly false.
Once again, the color of the coolant has absolutely no bearing on it's composition. You can mix them all you like and you will not damage your engine or radiator. The only warning is that if you mix more than 10% silicate-type coolant with an organic-type coolant, you must follow the replacement schedule of the silicate-type coolant i.e. you don't get the long-life benefit of the organic coolant.The mixing problem only arises from mixing a chromate-containing propylene glycol (PG) coolant with any ethylene glycol (EG) coolant. You end up with a chromate hydroxyl sludge that will clog radiators and engine passages. But AFAIK, only two companies currently sell PG based coolants: Sierra and AMSOIL. PG is slightly less toxic than EG, but does not cool quite as well.
