What does 10W30 engine oil mean? How is it different than 5W30 oil?

What does the 10W30 designation on engine oil mean, and how does it affect equipment? We answer these questions and more in this article.

Part number: 98JD37 Fit type: Vehicle Specific Package Weight: 1.75 pounds Package Dimensions: 22.352 L x 5.842 H x 4.572 W (centimeters)

Mobil 1 103535 High Mileage 10W-30 Synthetic Motor Oil - 1 Quart Bottle

New Holland Agriculture, Engine Oil - SAE 10W-30 - API CK-4 - MAT 3572 - 2.5 Gal./9.46 L, 73344219

From my understanding, the second number is the viscosity at running temp, so how come 5W-30 and 10W-30 don't go up to the same temperature? : r/MechanicAdvice

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Petroleum Quality Institute of America

CASTROL 160 fl. oz. 5 Qt. 10W-30 Engine Oil 15906F - The Home Depot

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Petroleum Quality Institute of America

10W-30 oil