I'd drain it, flush the system, and use a phosphate-free anti-freeze with distilled
water.  Don't temp fate.
-Dana-

Woody Halsey wrote:
>
> Dear List,
>
> What is our opinion of Gulf "Universal Formula" coolant. That is what my
> mechanic has put in my 83.5 1.9, along with 50% water from a hose. He
> claims that the Gulf product is safe and non-corrosive (though it does NOT
> say "no phosphates" on the label) and that using distilled water is not
> worth the trouble or money. Having read recent posts on this topic, and
> having just had the engine rebuilt (corrosion on heads machined out about
> 85%) I am worried that I will be looking at a repeat of the same leaking
> problem sooner than necessary, if I don't spend the monto use the best
> coolant and the cleanest ater now. Your thoughts?
>
> Thanks,
>
> Woody