Originally Posted by vtfd330

so the jeep is due for some new oil, so i ventured out today picked up some supplies...rotella 5w-40, a new mopar filter.
in preparation for the oil change i figured i would also get some marvel mystery oil to remove any accumulated gunk.
and since my engine bay was absolutely filthy, i picked up some purple power.

went to the car wash, used the entire bottle of p. power under the hood, and in the engine bay. hosed it off, and now i'm not ashamed to let people see the 4.0!

put about half the bottle of MMO into the crankcase for the drive home
about 5 minutes into my drive home i noticed a couple of things....first the persistant tick of the valvetrain was not making any noise, and second, the throttle response is back, acceleration is smooth, and the overall noise of the jeep is less.

perhaps its just coincidence, or maybe the MMO loosened up some gunk internally that was blocking oil passages or something.

the other thing i thought of, is maybe de-gunking the motor on the outside made some difference. i have heard that in order for 02 sensors to work properly, they need to sense the ambient air through small holes on the outside of the sensor.....perhaps those were clogged??

it seems that my gas mileage is back to normal, it has really been sucking down the fuel lately....
and its wierd to not have the constant audible tick from the motor, as well as it not sounding like a diesel!!!