I just found this site. I bought a used 2003 Lexus RX300 with 11K miles. It is now up for the first oil/filter change since we bought it. I happened to browse through some of the topics shown here and was surprised to read about problems with seals from using synthetic oils. I was planning on performing the oil/filter change myself using Castrol 10-30 Synthetic Blend and a NAPA 1348 filter. However, now I'm not so sure I should perform this myself and take the car back to the dealership for the oil change. I won't have any recourse with Lexus if I perform the job myself. Any suggestions would be appreciated.
