Thank you. This is helpful. I just bought a quart of ST 10w30 for my Honda lawnmower. It only takes 350 mL I think, and I change it once a year. The straight 30 for $4.50 is perfect, unless I have some random little dribbles of 5W-30 left over from other jugs.
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Fortunately I have moved, and these days are behind me, so SAE 30 is perfect!![]()
If you are changing it yearly, ANY 30 weight, straight or multi-viscosity, will be fine for the Honda. You are already far above and beyond the average owner

Depending on your level of OCD, this would also be a cheap and easy option. Again, both 30 weight at operating temp so all good.