Since I was going on a trip to Canada, I've decided to do my first service earlier (it was a free one). I stopped at my local dealer and they took care of everything. Somewhere in Toronto I noticed on a windshield in "next oil change reminder" sticker the 5W30 indicated. I checked my receipt and sure enough they used 5W30 instead of 5W20. When I got back home, I called them right away and stopped there to change oil. Their excuse was: "We use 5W30 on all Acuras for better winter protection" and " We only use 5W20 when asked". Now how ignorant is that? Even the oil dipstick says 5W20. Anyway, do you guys think it would have effect on engine in a long run? I put 1600 ml in the last 7 days before I changed oil back.