A close buddy sometimes has his strong lofty opinions and he’s a decent mechanical sort and worked as a mechanic at a truck shop. We got on the subject of engine coolant and he swears by Delco ELC being the best coolant ever made. I’ve always been selective with coolants in the various makes of vehicles I’ve had GM, mopar, a Ford or two. Seems to me (like no kidding Sherlock) use the coolant the mfg recommends. Lol, we got into another debate about rust prevention coatings when I was doing this on a rust-free truck box I bought; swears by por 15 where I said using this wasn’t the best application with what I was doing. Another topic. Anyway, any thoughts on what is considered the best coolants or have I already answered the question?