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Hey Future. Another member on here had just asked me the same question. Here is what I just wrote him.
So the reduction in viscosity is becoming a new thing with manufacturers these days when the stock fill is a synthetic. The overall premise behind this is that in the old dino oils there were used contained contaminants and sub par molecular structures. Under higher pressures these oils would compress and in turn be thinner ie less protection. Nowadays with synthetic oils they are engineered with tightly woven molecular structures with in theory make them uncompressable (is that a word lol) There is still some debate about this out there but thats the underlying premise. Being said that a 20 weight yes is a thinner oil then a 30 weight but remember engines are designed with smaller tolerances these days. Thinner oils are able to get into tighter areas faster. Rule of thumb is you can always go up in viscosity NEVER DOWN! If your planning on running the car stock as a daily driver and enjoying it, stick with the recommended oil weight. If you start upgrading the car, putting a turbo on it and racing it then you could up to a 30 weight oil. Remember protection comes with additives as well. Zinc and phosphorus are what you really should be looking for in oils. They help lube and protect the high friction areas like cam lobes and cyl walls. The higher the better. Increasing weight helps against breakdown from heat and alcohols in the fuel so that the oil still protects and doesnt turn into... well..."water" lol
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