Hello all. I am a long time reader. I know how to work ON the car, but that is as far as I go on mechanical ability. I have done a lot of reading and a lot of searching and could never really find a straight answer. So, without further delay, I currently own a '08 Toyota Yaris running with a Mobil 1. I have heard from many that it is not "true" synthetic or at least it doesn't compare to that of Amsoil or Redline. I haven't purchased Amsoil because I hear different advice about it; whether I can run it up to 25,000 miles or not. If I can't run it past 5,000 miles, I don't think I want to pay that much per bottle. Then, to make my life more confusing, I hear that I should just stick to Pennzoil Platinum. I must ask a few questions, if thats ok. 1) Is Mobil 1 a true synthetic? 2) Can I really run Amsoil (w/ their filter) for 15,000-25,000 miles? 3) FOR THIS TOYOTA ENGINE, which would be a better choice Mobil 1, Pennzoil Platinum, or Amsoil? 4) I heard that there is an item that is called an "oil catch can" to prevent sludge, does it work? 5) Is it true that I shouldn't let it idle to warm up; but instead I should begin driving as cold start up to prevent sludge? Added Information: It is a stock Toyota and I don't plan on making any performance modifications. It has over 23,000 miles. I live in Houston and I am full-time student and so I drive everywhere. I drive about 300 miles a week in freeway, downtown traffic, and whatnot. One more thing: I do plan on owning this car for longer than 5-10 years or until its rusts itself to death (which ever comes first) Thank-you and I apologize for the long read.