I once caught my friend Kenny pouring windshield washer fluid into his radiator fill cap... I don't think he got TOO much in there before I stopped him. To my knowledge it didn't cause any issues with his car. Thankfully. He and his family were on a shoestring budget anyhow - I'm certain they couldn't have afforded any kind of major car repair/replacement. And that was in the late 90s/early 2000s when used cars were still plentiful and relatively inexpensive.
Thankfully I've managed to not put any incorrect fluids into my vehicles - though I ALMOST put pre-mixed GM-Specific orange coolant into my radiator. I just grabbed the wrong container of pre-mix off the shelf. I'd already punctured the foil seal when I realized my mistake. Couldn't return it. So if anyone in Greenwood wants it...let me know.
Thankfully I've managed to not put any incorrect fluids into my vehicles - though I ALMOST put pre-mixed GM-Specific orange coolant into my radiator. I just grabbed the wrong container of pre-mix off the shelf. I'd already punctured the foil seal when I realized my mistake. Couldn't return it. So if anyone in Greenwood wants it...let me know.