There is nothing wrong with 0W-30 in place of 5W-30 or 10W-30 as long as it is synthetic, and it normally will be.
If you check out the article in my signature, you will see how the viscosity works.
A good full synthetic 0W-30 can be labeled 0W-30, 5W-30, 10W-30 and 30. I show a 10W-40 that has the same viscosity curve as other 5W-40's.
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