Not for oil changes/regular maintenance. Any changed parts, I would throw the reciept in the handy little dodge leather book sleeve thingy that came with the truck. My oil is changed by myself, every 5k KM. Actually just did the first since I bought the truck this AM. I actually did throw the oil and filter receipt in that little pack, but cant guarantee I always will. Just seemed like the most convenient place to put it.
Putting a 6 inch lift with 35's eventually anyway. That will effect resale far more than not keeping oil change receipts anyway!
