I hope nobody will mind some naive questions about coolant.

My local Yamaha main agent has been supplying me with the usual green
coolant which says on the label

Shell Motorcycle Coolant
contains 96.2% V/V (106.9% W/V) Ethylene Glycol

and recommends 50% 50% dilution.

Today I bought some more from the same source. This time it's blue and the
label says

Glyco Shell
Radiator Coolant
Anti-Rust
Nitrite, Amine, Phosphate (NAP) Free Formulation.Exceeds BS6580 (1992) and
AFNOR (1991)

and recommends 30% (coolant) 70% (water) dilution.

Obviously, I'm not worried about the colour. My questions are:-

Should I be concerned that neither product says anything about being
suitable for aluminium engines?

Should I stick to the original 50% 50% dilution or the 30% 70% recommended
on the label of the blue stuff?  Weather here in Singapore is 28c - 35c all
year round so it's only the heat transfer qualities that are needed and not
the anti-freeze protection.

I still have some green left. Can I mix the two?

I'd be grateful for any advice.

Trevor

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