I have the 1.8 non turbo engine and I do oil changes myself, so I have always used 5w-30 mobile 1 with a G.M filter. The cost of the oil at Walmart is around 25.00 for 5 quarts, the 1.8 uses 4.8 quarts of oil, so I buy the large 5 quart bottle because it comes out a little cheaper and you can save the little left over for other things. An oil and filter change should cost you if you go to Walmart for the oil and order 2 filters online about 30.00 per oil change.