I have recently had a motor replaced at a dealership due to their negligence doing an oil change .How can you be sure of the mileage of a salvage yard motor?
Typically you'll want to change your oil every 3,000 miles, but in most cases the 'maintenance required' light should go on indicating when you should take care of the oil and other duties.
Usually...
remove a plastic cover from the bottom of car, than you can see a screw (key 21) or imbus 10. turn off a screw and let oil to go out in some balloon. remove a cup from motor, to remove vacuum and...
100% synthetic will not go bad by itself. What makes 100% synthetic oil bad is basic oil filtration. The oil filtration system on a car is not very efficient, therefore allows the oil to get dirty....
Raise the front or get a shallow wide tray and release the 19mm plug at the back of the sump (oil pan) that will drain the oil. It will come out fast and be prepared for about 4 litres. Put the plug...