I am pretty new to BITOG and just wondered what you guys think about this. I have two vehicles; 2005 Dodge Caravan 3.3 V-6 engine and a 2004 Hyundai Elantra 2.0 4 cylinder. The Dodge is the first vehicle I have owned that specified 5w20. I am really impressed with how quickly and quietly it starts up in the cold here in Nebraska. I don't know for sure but I think this can be attributed to the thinner oil. Hyundai started to spec 5w20 as an option on 05 and newer Elantras and as far as I know the 2005 engine is identical to my 2004. I don't have warranty on either vehicle. It would be nice to just keep one grade of oil around. Would 5w20 cause any problems for my Elantra?