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Our old 6.2 farm truck runs on mostly WMO or WATF. We do pour some diesel in the tank every now and then when it gets cold. been running like this for more years than I can remember. Filter the W___? and run it.
i purchased a 5 micron filter for water filtration for making a test batch.
also i would recommend getting new atf and new motor oil and test those on small scale.