5W/50 compared to 5W/30
If you've got this synthetic oil - use it. It won't do any harm, as it will give a slightly heavier coating on moving parts.
It all depends how clean your engine is now after 156,000 miles. If you've always changed every 10,000 miles / annually, it should be clean without blockages anywhere to get clogged with a slightly thicker oil.
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