Like everything else, it depends. Is the motor fresh or does it smoke and burn oil? If fresh, that is too heavy an oil to use in it, use 5w-20 instead, if worn out and needing the heavy oil to keep the consumption down to a reasonable level, then use the heavy stuff, but rebuild as soon as possible.
As for the plugs, I don't use Autolites, so I don't know about them, but I do use Champion, and in those try a D-21.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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