re: Is 0w20 really what is best for our vehicles?

I don't know the answer to your question. I was taught to check my oil weekly and change when it wasn't clear. I did find this info though, might be useful -?

From castrol.com >

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WHY IS 0W-20 BECOMING SUCH A POPULAR GRADE?

Currently, 5W-30 and 5W-20 are the most popular grades in the motor oil market.  But in recent years, 0W-20 is the fastest growing grade and is in position to be the most common grade recommended by auto manufacturers in the coming years.  The reason for this is due to the technical advancements of automobile engines.  Recent years have seen developments such as hybrid vehicles, cylinder deactivation, stop-start engines, direct injection (GDI) and turbochargers.  All these changes are putting different stresses on the engine and as a result, on the motor oil.  

Despite all this new technology, fuel economy is very important to auto manufacturers. Auto manufacturers are driving more power out of the same or smaller engines. This results in the need for a thinner motor oil that are required for these vehicles. In general, auto manufacturers are requiring a 0W-20 more commonly for their newer vehicles which is the reason for the growth of the 0W-20 in the motor oil market.

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