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Originally Posted by Pete4
I read some article about thinner oil and the writer claimed 5w20 will reach all parts of engine faster than 5w30 etc.
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Actually, since the viscosity at cold is the same for both 5w20 and 5w30, there isn't any difference in the time for oil to spread to all components at start. 0w20 would reach all parts the fastest and then maintain the same viscosity as 5w20 at operating temperature.