2000? That's wimpy. Hold it at 3500 for a solid 3 minutes in park or neutral!!!

I would think it needs to be under load. Ill try it tomorrow

Why under a load? Think it's gonna blow?

Not sure tbh. Don't think its gonna blow but thought the best way to blow out carbon and such would be under load. Will do it in park tomorrow

Really think it knows?

Are we blowing out carbon with water or trying to loosen up a sticky lifter with Rotella?

Still doesn't know.....

Possible sticky lifters. Wasn't making noise like this until I ran rotella. Ill try your method. Shouldn't be carbon in there. I know the 4.0 is a diesel sounding engine

Depending on how she sounds I may run a qt of mmo in there

Then put it in second gear and take it on the freeway. You find all the cool exhaust leaks under load at 4000 RPM anyway! (3rd if you drive stick)

Can a sticky lifter be cured. Ill be happy to Rev it and drive. Wanna make sure the new style Napa gold filters aren't bad. Noise is louder at startup and get quiet when warm

Do an engine flush when you do your next oil change then use synthetic oil

My Zj 4.0 doesn't seem to like the heavy rotella as much as my older renix 4.0 did. Idk just a side note lol.

Yes, it can. 3 minutes at 3500 RPM in park. May have to repeat a few times. Maybe in the weeks to come. The filter should be good. YOu could go buy a new one and put it on. If the noise stops, return the original filter to Napa for a refund.

Washed my xj after wheeling

You missed a few spots.

Pads and rotors today:



Definitely overdue for pads!

Finished up my bushwackers. Kinda. Need to pull the fronts and remove the badges.