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Difference Between 0W-30 and 0W-40 Oil
 
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Question:
Difference Between 0W-30 and 0W-40 Oil
What is the difference between 0W-30 and 0W-40 oils?
-- Art Castellanos, Lancaster, CA
Answer:
From a viscosity standpoint, a 0W-40 motor oil will have a higher viscosity at high temperatures than a 0W-30 oil, while having the same viscosity properties at low temperatures.
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