This is about my wife's Elantra named "Ellie":-)(isn't that ingenious the car is still young, with only 8,000 miles. At first start up, it feels like the engine/car shakes for a fe seconds, and settles down after a while, smooth and quiet(sometimes does this in idle, too). Also, to me it sounds like it's pretty loud, but it can be that Elantras are noisy, up to the 3-4 shifts.(I have no proof that all this is oil related, but PERHAPS it can be made better?) I'm not complaining about the oil dealer uses(Pennzoil 10/30 dino, every 4,000 miles), BUT in the manual, oils up to even 20/50 are recommended, so I was wondering IF a different oil could be better for this high-revving DOHC 4-cyl.engine(redline 6500 rpm), especially in summer(the car has a 100K miles warranty, though...I wonder if I'm allowed to use something else) IF I can ask the dealer for a different oil, what would be the best dino oil/weight for this car? Perhaps some Elantra owners can help? Thanks.