I agree with Big Jim on conventional oil. The cost alone, plus changing @ 3000 miles, the oil never gets close to the black color(I know the oil is doing its job, hense it gets dark, keeping the engine clean) that the synthetic oil would be at ,say 5,000 miles, keeps the engine cleaner. On my sisters BMW, a 2000 model, normal oil change interval is 15,000 miles. At 15,000 the oil is "BLACK" and feels thicker than the 5-30 it started its life at. I have since started to change it @ 7,500 miles, since she is planning to hold on to the car. Another reason I wouldn't want to buy a car off a lease.
