Since the wife has been driveing my vechile instead of her's we have been racking up double the miles at an alarming rate. I have 6000 miles on the oil and it has maybe been in close to 3 months. So their is no way I was going to make it 6 months or 9000 miles. I also have some business comeing up out of state. I di not want to end up out of state ont he road and need to change oil.I also hate haveing to lie on a cold damp concrete floor once the snow starts falling. I added 3/4 of a quart of Diesel Lube Oil Extender to 3 1/4 quarts of M1 TSUV 5W30 not to be confused with M1EP 5W30. It will be interesting to see how this sample does? I will try to rember to take a sample of this when the time comes. Let's hope 427Z06 does not read this!!!He will give me a stern brow lashing about ZDDP and underperforming catalytic converters!!!!