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
What is advantage (if any) of using 10w30 over 5w30 if the only difference is viscosity at startup? : r/MechanicAdvice
Using 10W30 or 5W30 in Texas? : r/KiaSoulClub
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