Hi everyone, I'm a newbie! I recently purchased a G35 Sedan with a 3.5 VQ series engine. I'd like to switch over to a synthetic oil, but I'd like some opinions as to when? Dealer recommends first oil change at about 1200-1400 kms, should I continue with more dino oil for proper breakin? I'm considering Mobil 1 5W-30 when the time comes or even Amsoil if its reasonably priced. Car is not daily driven, but will be run hard through all gears very frequently:) Not looking for extended oil intervals, but excellent protection and freeing up some hp! Thanks ps. GTA members please post dealers for Amsoil as M1 can be had at the local Walmart.