Posted by jeepwm69 on September 19, 2023 at 11:19:25 from (144.30.0.114):
I have a 77ish Deere 2640, mainly used for Bush Hogging around the farm.
My local radiator shop guy is getting up there in years, and will likely retire soon, so this year I took the radiator off and had him boil it out and get it good and clean.
Put it back on, filled with reg green Prestone and distilled water 50/50. I've mowed a couple of times with it and everything is working great, engine is staying nice and cool.
Then a guy on another forum mentioned that I needed to put in some coolant additive to prevent cavitation and cylinder wall erosion. I looked it up and it does appear to be a thing. That said, in talking to several local farmers, the guys at NAPA, and even diesel pickup owners, nobody around here has ever heard of this.
I did find a bottle of Napa 4058 on the shelf, which a couple of forums said to use, but the guys at NAPA (who are usually pretty good around here since it's a small farming town) knew nothing about it.
https://www.napaonline.com/en/p/FIL4058
So, my question is, should I be concerned about this on a late 70's low HP tractor like this, or can I just run my 50/50 mix of Prestone and distilled water? I don't know what was in the tractor when I drained and removed the radiator. It was whatever was in there when I bought it 10-12 years ago.
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