Lindajane,

It depends opn 2 things : type of driving and type of oil.

Since you drive mostly city driving, you should probably change every 2500 miles with dino oil and 5000 miles with synthetic oil.

Me, I go 10,000 miles using Mobil 1 or Castrol Syntec. But I do enough trips that the engine gets hot almost every the time I use it.

P E H