Hello, this is my first post to what I see is an excellent website. I have spent the last 2 days reading up on all the posts and have learned alot but am confused on the following. I have gotten so far that for new car warrenties, stick with the manufactures recommendations. In my case, its a 2002 Elantra, that recommends 10w-30. I currently change oil and filter every 5000 miles, on all my vehicles, been doing this for years and seems like it works for me. I have read into the filter section, and surmised that Mobile One filters are the best on the market for OTC type filters. OK, Got my choice there. As for oil, thats another story. I cannot find any recommendations for a good (preferably synthetic) motor oil, in the 10w-30 weight, that is OTC type. I am not interested in using amsoil or other mail or rep-based oils, I just want something good quality that I can go whenever I need to Autozone or Wally-World and pick it up when I am ready to do the deed. My 1st choice before I found this forum was Mobile One Syn 10w-30, my second was castrol Syntec 10w-30, but have seen on numerous posts things like: 'I used to use these but now I know better', etc. but I have seen nothing as to reasons or proof as to why either of these oils are 'bad'. Can anyone give me the real deal on the OTC oils, and what is the current 'best OTC 10w-30'? Thanx so much in advance, and again, a great site!