In my sons Saturn SL1 I use 5W30 Supertech Oil. Supertech is made by Quaker State/Shell/Penzoil and in some cases Mobil 1. It is set up by region. The oil is synthetic. The cost is about 20
In my other son's car a ford Taurus. And my wife' Kia Sportage we use Motorcraft Synthetic Blend from Walmart for $18.00 for 5 quarts Motrocraft filter $4.00 The Kia filter is $6.00 at the dealer.
Recently the Kia dealer is offering 14.95 oil and filter change. Still that is a good deal. They actually use bulk oil and change it. Not just look at the oil.
My Dodge Nitro gets the oil changed at the dealer for free includes 6 quarts of 5W30 synthetic blend and filter.
Oil is an easy to do item that will make your engine last.
The oil in all fte cars is changed every 3,000 miles or 3 months.