Looking for a good top up antifreeze for the SM 630. Can not find the Castrol blue antifreeze that comes from the factory.Are most motorcycle Silicates free antifreeze brands ok to use.
To be honest I don't know enough about AF to answer well, but what I did was use a little BMW OEM antifreeze in mine (had some laying around, it's blue, and figured what the hey, it's only a little.) It's a little pricey and it's of course available at any BMW dealership.
I used the blue Honda auto anti-freeze as it is the specified ethelyne-glycol type since I couldn't fine any Castrol, anywhere! Hope it is OK!
In the future if your only topping up a small amount skip the antifreeze and just add distilled water. Unless your bike is in really cold weather. On all my bikes I mix automotive antifreeze with distilled water 50-50. Almost all modern antifreeze's are compatible with each other and with all kinds of metals.