I just recently had a rebuilt engine installed in my 02 TJ. The mechanic changed the usual parts from old engine to new engine including dip stick and dip stick sleeve. When I got the Jeep home I checked the oil level and it registered below add mark. I added a quart and it came up to safe. Now I go to change oil after 500 miles and install 6 quarts of oil the dip stick registers below add again and I know I put 6 quarts in ???????? Any suggestions. Can one dip stick be off from one motor to the next ????