What kind of oil does the 2001 Hyundai Elantra use?

The 2001 Hyundai Elantra comes from the factor with conventional SAE 5W-20 oil, though some trims are installed with 5W-30, the higher viscosity of which gives better performance. Even though this is an older vehicle, it's safe for You to go with synthetics in it; though the higher cost can be off-putting, the longevity and better performance tend to make up for it. Given the age of Your vehicle, You might want to explore some of the oil options for higher mileage vehicles. You should get Your oil changed every 3k to 5k miles if You're using conventional, and around every 10k miles if You're using a synthetic. If You're replacing it YourseLFAnd looking for a decent product, try Castrol's High Mileage 5W-30, part number 15980E; this runs around $30 for A5 quart jug, and will suit the lubrication requirements of Your Elantra.