Shamrock, you're way too hung up on oil selection. Which type of oil is best is way, way, overstated in oil discussions. Use the oil recommended in your owner's manual and you can't go wrong, full stop. Guess who specified that oil? The guy who knows better than any forum discussion oil guru's - a Nissan engineer! There is no best oil because other than synthetic is better than dino but you pay a premium. Both oils will lubricate your engine without issue. It all comes down to personal preference. If you feel better having your maintenance performed by a Nissan dealer, then take their advice on oil selection. Now, quit worrying about oil and go enjoy your car.
