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The heavy oil will take more power to cirrculate and take longer to get to the areas that need protection on start up, and thy really only offer a higher protection at much higher temperatures where it's dangerous to run the engine in anyways...
If your engine is built properly, 10W30 is 2 times better than 20W50, from start to finish....
Overall 20/50 will help maintain a higher oil pressure rating on a worn out motor because it does not get squirted out of the worn out places as fast as 10/30, and will therefore protect a worn engine better, but it won't protect a newer engine any better and can possibly shorten the life because of the delay in start up protection because of the extra time it takes to push heavier oil to where it needs to be.

FE
 
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