2011 Prius oil change. I'm aware that synthetic 0-20 is the oil of choice, however there are dino 0-20 oils as well. Is unwise to use the dino oil? My dealer support person says the synthetic is good for 10K miles, should I accept that as gospel, seems a lot of miles on one change. What is the cartridge filter number, I'm doing my own oil changes, can't be that difficult.