Hey all, I did my first mod last week, switched over to synthetic engine oil, I know not a mod but it sounds good anyway. My question is how long do you all leave your oil before you change it, I put in amsoil which is rated for one year or 40,000km (26,000miles I think?) which seems crazy to me. I talked to the dealership and they said toyota does not have anything in writing that deals with synthetic oil drain times and to go by the oil manufacturers recomondation. What do you think, stick to regular service intervals or go by oil manufacturers recomondation? Thanks for your input.