I plan on doing an oil change myself and I plan on switching to sythetic for the first time. The car is 2002 Lexus ES with 29K miles. Is it safe to switch on sythetic with that age and miles???? Also I live in Chicago and plan on going with MOBIL EP full sythetic 5W-30. Is 5W-30 good for this type of car????? I will go with OEM oil filter please respond thank you.