My question is how many miles should I go between oil changes.  I have heard from 3-7 thousand. 

Very controversial question and with that in mind I will give you my opinion on how often engine oil should be changed.  First, understand that oil is the lubricant for the internal moving parts of the engine.  As the engine runs, carbon created by the internal-combustion engine along with condensation due to the heating and cooling down of the engine contaminate the oil.  The contamination breaks down the oil's ability to lubricate the bearings and other moving parts inside your engine. The amount of contaminate in the oil is directly proportional to the longevity of your engine. The more miles you drive,  the dirtier the oil gets and the faster the engine wears out.  I hope you have the necessary information to make your own decision.  Personally, I recommend every 3,000 miles for standard engine oil and every 5,000 for fully synthetic engine oil.  On vehicles with 4 and 5 quart capacities, vehicles with higher capacities can go more miles between changes.