Firestone said they would only use 0W-30 ACEA C2 or above for an oil change, the dealer regular 5w-30 is OK and they have an oil change special for $44.95! After carefully reading the manual it appears that ACEA C2 or above is required. The only oil to meet that spec appears to be Mobil 1 ESP 0W-30. I would appreciate any comments in regard to this with any recommendation of oil that meets the Genesis specification. Also due to the cost of the oil I plan to change it myself (Firestone wanted $120.00). I would appreciate all feedback!