I use 10W30 in my Super C but only because I occasionally ask it to start in the winter (I live in Northern Maine) to plow my driveway. It sleeps in an unheated garage and sometimes my 1963 GMC plow truck wont start but I can always depend on the Farmall. It's still 6 volt, but I have two batteries on it. If it wasn't for the cold starts, I would use either straight 30 weight or 10W40.
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