I just changed my oil with 5W-30. The beast took 9 quarts!! I'm assuming that it has some kind of large oil pan mod as well. At first I thought I had forgotten to put the plug in the bottom, but when I refilled the quarts with the used oil, it seemed to match up fairly closely. (7.5 quarts, but I spilled a ton as well). Would it be safe to just add the Marvel Mystery Oil at this point and change my oil again after 3000 miles? I'll try to drive it for a bit now and see if just the change helped. - - - Updated - - - I found this from this site: http://www.theimportkiller.com/forums/index.php?topic=420.0 CODE 43 Trouble Code 43 indicates that there may be a malfunction in the Electronic Spark Control (ESC) circuit. ESC is used to sense spark knock (pinging) and retard the timing to eliminate it. The knock sensor is located at the rear of the engine block. The ECM will retard the timing by as much as 20 degrees in 1 degree increments. A loss of knock sensor signal or loss of ground at the ESC module will cause the signal at the ECM to remain high. The ECM will act as if no knock is present, and may possibly result in engine damage, due to detonation. Code 43 is set when: ? Voltage at Knock Sensor is above 4.8 volts or below .64 volts. ? Either condition is met for about 10 seconds. Possible causes: 1. Open or shorted knock sensor 2. Loose knock sensor 3. Excessive mechanical noise within engine 4. Improper or incorrectly installed MEM-CAL in the ECM or defective ECM 5. Intermittent open in the EST line to the ignition module I figured it might just be a faulty knock sensor causing my problem. Am I on the right track with that?