2011 Hyundai Elantra: What is the oil type and capacity?

Each configuration of the 2011 Hyundai Elantra comes with the same 1.8L 4Cylinder engine. That means no matter which trim level You have, You'll use the same oil type and capacity. In this case, You'll use 4.2 quarts of SAE 5W-20 synthetic motor oil, though it's possible to substitute SAE 5W-30 in emergency situation. This, however, is not advisable if it's avoidable. The reason deals with oil weights and viscosity. The higher the numbers, the thicker the oil -- first, at startup temperature (5) and next, at operating temperature (20 vS30). Thicker oil will introduce friction into the system, which can lead to premature engine wear and tear. You're going to want to use the manufacturer's recommended oil with the lowest numbers for the best longevity out of Your Elantra, even if it costs a few more dollars per oil change.