We had some extreme temps last year, and my water temps hit the extreme zone a few times. Oil temps pegged 260F as well. This was just normal every day driving. Plus, this car (FI or NA) doesn't like to be left idling in direct sunlight with ambient temps above 100F either.

I've not had any issues this year, but ambient temps did hit 100F on a couple of days. I've not seen the water temps exceed the usual mark. Oil temps average 205-210F peak. I've only seen it hit 220F after doing some hard runs. Other than that, it's pretty good. Only difference is that the system was burped again the past 6 months, which may have helped. I still hear some bubbling in the heater core at times, though.

BTW, any of you used water wetter? I know nothing is guaranteed, but I wouldn't mind it helping a tiny bit. I've got some Redline over the weekend.

I almost bought a bottle of it, but I find reviews to be 50/50 so not sure if it is worth doing.
I have heard a few people say to use a blend of the OEM stuff & distilled water.

It's only $10. As long as it doesn't do harm like rust stuff, destroy turbos, etc., I wouldn't mind trying haha. Sorta like the Chevron Techron. I tried it once. So far my car is still running.

I run WW and water in my Z.

Just the WW added to the OEM fill helped a little, 3-4 degrees in normal use. The effect is a lot more dramatic with straight water.

Reducing your coolant mix to ~15% antifreeze (and thus raising your freeze temp to around 10-15 degrees F, so if you live in Fargo or something, probably not something you want to do) and adding WW will make a dramatic difference.

Minus the removal of antifreeze from the system and its plus & minuses for a daily driven car. Are there any potential negatives from running more water into the system? Need to dump the fluid more often and refill or anything?

Not if you run distilled.

I've heard mixed opinions on whether or not you need to run distilled if you are running zero antifreeze, as apparently the minerals in the water mostly affect the antifreeze itself, causing it to goop up and exacerbate sediment formation.

I'll admit, I'm running hose water. If I put a thousand miles on the car this year, I'll be surprised, so I'm really not worried about it. I'll be dumping the coolant regularly enough that it won't be a big deal, I'm fairly sure.

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Ah crap I typoed on you. xxx-xxx-xxxx

Editing original post. Sorry about that...that's what I get for posting from cell phone