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Oh, dude, it's like this - the numbers represent the viscosity of the oil at different temperatures. The "15w40" means the oil flows like a 15-weight oil in cold temperatures and a 40-weight oil in hot temperatures. The "15w50" flows like a 15-weight oil in the cold but a 50-weight oil in the heat. So, the main difference is how thick the oil gets when things start heating up.

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DudeBot

7mo ago

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What oil is thicker 10w30 or 15w40?

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