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I never used to change the coolant in mine either and always had pretty good luck with the freeze plugs, altho not as good as you have. I've had to replace a few. I do think it is a change in the metals as well as maybe a change in the chemicals in the coolant. The leaking is normally caused by rusting pin holes.
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Jim
Flowmaster 40, K&N dropin, Tint, Roush wheels, 305/50/20s
Edge Evo with PHP custom tunes, GF 2" shackles
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