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Based on what I learnt from here and elsewhere, I am going to use 0W-20 on my next oil change.
The only reason that I can think of why people are using 5-20 or 5-30 instead is because the viscosity of the oil in connection with the outside temperature where it is much warmer/hotter. Engine parts don't always want thinner oil, especially when the temperature outside is very hot, which makes the oil a bit more watery and less effective as a lubricant. Like transmission oil, when outside is very hot (ie, 95 degrees), it becomes watery and your car isn't performing at its best.
Last edited by NissanCarOwner2013; 02-19-2013 at 03:29 AM.