I run about 40% anti freeze 60% water in winter and then 30-60 in summer. Winter here it will snow and get below freezing so anti freeze is still needed. I just read your advice or info about anti freeze in your oil and just learned that. I never knew this before and when I changed my intake manifold I used the end seal gaskets and they leaked and got antifreeze and water into my oil A TON. I drained both and took the manifold off and got ALL the water out of the block that I could and then didn't use end seal gaskets this time, just silicone. I ran the motor for a while with the water in it because for the first ten minutes it wasn't leaking at all. Then later after running it for about an hour or a tad more I looked in the oil and ALL FOAM. I took off the intake manifold and just tons of antifreeze, etc. That time I had 50/50 mix.