i used to own a 04 camry before it got rear ended. it had over 300k on the clock. it always ran 5/30 10/30 10/40 15/40. is there anyone here that has a vehicle over 250k that has always had 0/20 in it? i dont see a thin oil and engines lasting 500k. as the engine wears, whats going to provide extra film in the cylinder walls? when you start looking around overseas, the exact same engine used in the same car over there, they run a higher grade oil, and the manual states 0/20 for best mpg, but we really want you to run a 30 or 40wt you can also go to M1 and it will tell you. google m1 uk, enter vehicle, and engine, you'll get the weight they use there. i think the European cars use a higher weight oil for a reason, its better for protection, especially constant high speed driving