Anywhere I suppose. I check mine at the cap quite often. I use one of these as well.
https://www.amazon.com/EPAuto-Radiator-Coolant-Filling-Funnel/dp/B01I40ZQWE
I’ll have you know Skeets, it’s a sure sign that the ATM machines will rise up to kill us all in a fit of AI rage, now that my phone autocorrects ‘Sakrete’ to ‘Skeets’…
dang, it just did it again
If only they had synergistically leveraged their core competencies across the entire value chain, they could have landed high on the S-curve, and in the spirit of collaboration and transparency, avoided silos, blah blah blah…