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I replaced my timing chain on my 4.0 in my 00 Cherokee recently. Did it at 189k. It was making a lot of noise up front and now it's all but gone.

ZF recommends a 100km interval, so mine is a bit over that (approx 112km). It depends on how your truck/trans was used. Mine is used mostly for commuting with the occasional haul and tow. I would shorten the interval if the trans saw more severe use.

Changed my trans fluid at 70k recently. I don't see many UOAs of the ZF fluid, so here is one! The truck is used mostly for daily driving purposes in city traffic. I have towed and hauled at near capacity a few times in my time with the truck (bought at 38k miles), so it has been put to work...

I've had a couple of good used oil reports from running PP 5w-20. I have posted them here so check them out if you want. I stick with 5-7.5k mile intervals, which works out to be about 2 times a year. Currently running PUP 5w-30 to see if I get any improvement on wear numbers. I have not...

I have the same truck and have used PP 5w-20 without issue. I even have two UOA's posted here showing how well it does. My OCIs have been around 6k with both analysis' showing I could go longer.

FYI I email Blackstone about the uptick in potassium and they didn't seem worried about it. They said if there were a coolant leak that the levels would be much higher.

The only repair it had during this time was made under warranty. It was the common issue of the exhaust manifold leaking due to broken bolts. I noticed the potassium increase but didn't see a noted increase in sodium and silicon. I have a UOA from my Jeep 4.0 that shows high potassium, silicon...

Posted this on Ramforum, but I figured here would be good too. Here's my most recent. Another good showing for PP 5W20. I'm sticking with 6-7k miles per change. Went with 5qts of PUP 5w30 and 2qts PP 5w20 this time. Used up some old stock is the reason for mixing. <img...

Mine has either piston slap or lifter knock at all temps. Runs fine, plenty of power.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by aquariuscsm</div><div class="ubbcode-body">Does pphm have more moly than pp? </div></div> Seems like it. I run PP in my Ram 1500 and the moly numbers are lower. I didn't use additives or add any oil during this interval.

Thanks for the replies everyone! I don't drive this Jeep very often. I've only put a little over 5k miles in 3.5 years of ownership. While it's nice to see that the oil could go longer, I'm sticking with annual changes to keep things easy for me. I've previously ran Rotella T5 and T6 with no...

This year of jeep had a common problem where the head would crack and coolant would get into the oil. I replaced the head 5k miles ago and haven't had a problem since.

Very happy with this one. Previous report on this one was to test for coolant in the oil for the common 0331 head problem. Filter was Fram Ultra. 5w30 RGT went in for this change. <img...

2000 Jeep cherokee XJ 4.0L 189k miles Out: Pennzoil Platinum High Mileage 5w30; Fram Ultra Filter In: Shell Rotella Gas Truck 5w30; Mopar OEM filter OCI: Approx 2k miles, One year (always change at 1 year)

Congrats on the truck. I have a 2015 1500 with the 5.7. I've done three oil changes so far and have run Pennzoil Platinum 5w20 in all three. I posted two of the used oil analysis here and they've come back great. Gonna switch to 5w30 this summer and see what happens. I've run a Bosch...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by oil_film_movies</div><div class="ubbcode-body">Pennzoil usually performs well in UOAs. I've used the 0w20 flavor myself mainly due to the nice $10 rebates on a Walmart jug. Also, notice your use of Platinum here exceeds...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by dave1251</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by fijicorey</div><div class="ubbcode-body"><div class="ubbcode-block"><div...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by dave1251</div><div class="ubbcode-body">Looks great did your iOLM tell you to change it?</div></div> No, it had about 25 or 30 percent left.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by Triple_Se7en</div><div class="ubbcode-body">Because 0W20s most always use 2-3 times the amount of POA in 0W20, versus that of 5W20, if this were my vehicle and I remained adamant on using 20w oils, I would be using a...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted by CT8</div><div class="ubbcode-body">Nice numbers, but is it the oil or is the engine a good wearing engine? I used to work in fleet maintenance and we has over 300 of one type of fork lift. some at 30,000 hours ran...