starter wirring noise and coolant

My 54 plate 1.2S sometimes makes a short whirr from the starter on cold mornings, doesn't seem to be a problem but is the starter on the way out or just sticking?

Also thinking of a coolant change. Have 5 litres of green Mazda supercoolant for my MX5, whould this be OK in nissans? I heard all jap stuff is the same supplier. Only 12 quid from mazda dealers not sure if nissan is cheaper...
 
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