If you're not in sub-zero temps, does this first number make any real world difference in automobile engines?
I understand cold flow differences make the 0w flow better than 5w at a certain ultra cold temp, something like -35 degrees below 0.
Likewise, 5w flows better than 10w at something like -30.
Let's say you're living in warmer states in the CONUS, where temps never get below -20 (and rarely get that low). Is there any real world difference between using a 0w, 5w, or 10w motor oil provided the oil is within spec otherwise?
As a follow up, is there a tradeoff to better flow, with a wider spread in the numbers? For instance, 0w30 may flow better when cold, but if cold flow is unnecessary say in a hot summer climate would a 5w30 or 10w30 be superior b/c the numbers are closer together?
I understand cold flow differences make the 0w flow better than 5w at a certain ultra cold temp, something like -35 degrees below 0.
Likewise, 5w flows better than 10w at something like -30.
Let's say you're living in warmer states in the CONUS, where temps never get below -20 (and rarely get that low). Is there any real world difference between using a 0w, 5w, or 10w motor oil provided the oil is within spec otherwise?
As a follow up, is there a tradeoff to better flow, with a wider spread in the numbers? For instance, 0w30 may flow better when cold, but if cold flow is unnecessary say in a hot summer climate would a 5w30 or 10w30 be superior b/c the numbers are closer together?
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