I currently use Pennzoil Yellow bottle 10w30 in my Jeep 4.0L since it runs quietest on this oil.
My buddy bought a 2000 Cherokee 4.0L about a year ago. It was owned by an older couple, and they had all the service records for the 96k miles they owned it. As some of you know, the 2000-2001 Cherokees have a weak head casting that can crack. Everything indicated that his cylinder head was fine, but since he had the money and time, we swapped the head with a stronger casting from Clearwater Cylinder. This Jeep routinely sees road trips to other states so we wanted it to be reliable as possible. At the time of the head swap, the Jeep had 125k miles. Since the previous owners used PYB, my buddy continued to do so, since I told him mine runs quietest on it.
The previous owners included a stack of receipts for oil changes and tire rotations, among other small things. The Jeep always had the oil changed in 4500-5000k mile intervals at Jiffy Lube with Pennzoil Yellow Bottle 5w30 or 10w30. When swapping out the old head, we found this under the valve cover:
Rocker arms removed:
I was very impressed with what I saw. We will continue to use PYB in our Jeeps. For the price, it seems like a great oil!
Oh and here is the new head:
And the finished product:
Sorry for the blurry pics, they were taken with an iphone for a how-to thread I did for a Jeepforum.
My buddy bought a 2000 Cherokee 4.0L about a year ago. It was owned by an older couple, and they had all the service records for the 96k miles they owned it. As some of you know, the 2000-2001 Cherokees have a weak head casting that can crack. Everything indicated that his cylinder head was fine, but since he had the money and time, we swapped the head with a stronger casting from Clearwater Cylinder. This Jeep routinely sees road trips to other states so we wanted it to be reliable as possible. At the time of the head swap, the Jeep had 125k miles. Since the previous owners used PYB, my buddy continued to do so, since I told him mine runs quietest on it.
The previous owners included a stack of receipts for oil changes and tire rotations, among other small things. The Jeep always had the oil changed in 4500-5000k mile intervals at Jiffy Lube with Pennzoil Yellow Bottle 5w30 or 10w30. When swapping out the old head, we found this under the valve cover:
Rocker arms removed:
I was very impressed with what I saw. We will continue to use PYB in our Jeeps. For the price, it seems like a great oil!
Oh and here is the new head:
And the finished product:
Sorry for the blurry pics, they were taken with an iphone for a how-to thread I did for a Jeepforum.
