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Originally Posted by z3scott
What ratio are you using?
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I'm using 10% - as specified by
Valvoline.
I expect I could use less - but I wanted a full dose of the anti-corrosion package.
This stuff is also sold at cooltechnica - and they specify 5%, so maybe that's OK.
All that said, the Swiftech stuff is purpose-designed, so it'd be hard to go wrong with that, whereas using Racing Coolant is more of a DIY "this stuff is designed for a somewhat-similar application" kind of thing - not as out there as using toilet duck, however
As far as glycol extending pump life, hmmm... I don't think any of the Eheim aquarium pumps were designed with glycol in mind - and these have been very reliable for me, using 90/10 distilled water / racing coolant.