And as an update, apparently the Castrol motorcycle coolant isn't silicate free though, so apparently that's a thing as well. The manual says a glycol-based coolant which is compatible with an aluminium radiator but the internet also says ethylene glycol only, OAT, silicate free and also pink. I've never been so f- confused
I was going to try and explain it myself but here's a much more concise unit of text from a manufacturers website.
All coolants contain a mix of water, antifreeze agents (such as ethylene glycol or propylene glycol) and corrosion inhibitors, of which there are three types:
Inorganic Additive Technology (IAT) – Conventional low-silicate coolants, some of which require the addition of supplemental coolant additives (SCAs) every 25,000 miles or so.
Organic Acid Technology (OAT) – Nitrate-free coolants that provide between 600,000 miles or 12,000 engine hours of service without need for SCAs.
Nitrated Organic Acid Technology (NOAT) – Extended-life coolants containing organic acids, nitrate or molybdenum. They require SCAs every 300,000 miles or 6,000 engine hours in order to reach their 600,000-mile or 12,000-hour service intervals.
Hybrid Organic Acid Technology (HOAT) – Combining OAT and IAT inhibitors, these low-silicate, nitrated coolants require an SCA after 25,000 miles or so
If your still in doubt OAT "Pink" is silicate free or you can't go wrong with the genuine stuff from Suzuki, simple.