Originally Posted By: jls095
Originally Posted By: KCJeep
Another great PYB Jeep 4.0 UOA, thanks for posting! Was this the High Mileage or regular Yellow Bottle?
Thank you! It's just regular yellow bottle. And like you've alluded to in other posts, my 4.0 definitely runs quieter on PYB as opposed to others.
Originally Posted By: jeepman3071
6,000 miles is doable, but I wouldn't go 9,000 miles on conventional oil in this particular engine. I've seen plenty of sludged up 4.0s, and my own engine is pretty dirty inside from previous owner neglect.
I'm going to keep my OCI schedule the same. The only modification I might make is changing the filter annually (every other OCI) instead of bi-annually. I'm trying out a massive Baldwin B7311-MPG for the first time - it has great flow properties, outstanding filtration, and ridiculous capacity. Given that the Jeep holds 7.0L of oil (with the bigger filter) and that this UOA was solid, I'm confident that the bit of oil that doesn't get drained (kept in the filter) won't be a problem.
I will mention that with the Baldwin filter, my oil pressure is slightly higher and pressure builds quicker at start-up (check gauges light no longer flashes for an instant). I had previously used Wix, Mobil1, or K&N filters. Here's more info on it, beginning on post 24:
http://www.ihpartsamerica.com/forums/bas...-filters-2.html
I don't think you can do better than the Baldwin B7311-MPG oil filter, that is a great filter. I would go 12k miles and cut it open and I'll bet it will be clean with no tears. I go 15k to 21k miles on my Baldwin B202(this filter is a little over twice as large as the stock S2000 filter) That I run on my S2000 and even at 21k miles it looks like a new filter on the inside. The B7311-MPG is larger and can hold way more contaminates plus it filters better than my B202. Try it and let us know how it looks. Also take some pic's of the filter.
Here is a B7042 that has 15k miles on it(same size as the B202) that I use to run on my S2000
http://s949.photobucket.com/user/rrounds/library/Oil Filters?sort=2&page=1
ROD