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The difference between the two is marginal and either can be freely used. Theoretically the 10W-40 is slightly more fluid at low temperatures.

As a sound thumb rule, follow Manufacturer's instructions for YOUR climate area.

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12y ago
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Q: Why use 15-40 for Skoda felicia - why not 10-40 because 10-40 will be better in lower temperatures wont it?
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