2016 Chevy Trax has pink G12+ in it, and G12+ listed in manual. Been 5 years and the fluid still looks more-or-less new, but it's apparently time to replace it. Since I have to flush it and replace it all anyway, should I update to G12++, or G13? Or should I just continue using G12+? Most sites say it's fine to update, but one points something out that makes me slightly hesitant.

https://www.wolflubes.com/EN_EU/Blog...d-coolant.aspx says:

"G13 is not the best choice for older cooling systems with copper/brass radiators and heater cores. It doesn’t work well with the lead solder. Use antifreeze with G11 or G12 specification instead."

Is that issue something I'd have to worry about on this particular vehicle? I can't seem to find anywhere that specifically lists what materials the radiator or heating coil and their solder joints are made of. They don't appear to be copper or brass in any way, and I doubt they are internally soldered with lead solder, but I really don't know.