I can't say what the different colors mean, but why not use what's
recommended for your subaru engine? It would seem that the rest of
the system would not care. Also, does your engine year also ask for
the "genuine subaru coolant conditioner" AKA bars leak type sealer?
That might be a consideration as there were issues with internal
headgasket leaks on some subarus which were "cured" with the
conditioner.

Aaron
'85 Vanagon with '02 subaru 2.5L

On Aug 8, 2006, at 2:55 PM, William Manley wrote:

> What are the pros and cons of blue vs green vs orange coolant?
>
> This is for a 91 syncro westy.  I know this has been discussed in the
> past, and that it is important to use phosphate-free coolant with
> distilled water.  But I'm still unclear about the colors.  Seems like
> most people recommend the green coolant, but blue is maybe better
> though more expensive?
>
> Recommendations on brands much appreciated.
>
> Thanks,
> Bill
> Boulder
> (w/ an '01 2.5L subie engine)