I have always used NGK ZFR6F-11G
They are the correct factory recommended copper core spark plugs for the KJ (2002 to 2007)
Set the NGK plug gap at .040 inch
Fuse 39 is the interior panel/fuse. Does the fuse blow by activating turn signals alone? Or just in reverse?
I have the 2004 FSM but wow wiring is a PITA.
Why are you so concerned about oil temperatures? I Use quality 5w-30 synthetic Mobil1.
I would be more concerned about coolant temperature, in which case an OBD2 ScanGaugeII can read the coolant temps.
Probably the front diff breather hose hanging down?? which should be routed higher up in engine bay.
What diameter is the hose? 5/16 ?
Oil light coming on, probably the oil pressure sensor needs replacement. It is located near/above the oil filter. Any leaks around oil pressure sensor?
The PML 42RLE aluminum transmission pan is the way to prevent the dreaded transmission light.
Never had another Transmission light since.
https://yourcovers.com/pml-chrysler-dodge-42rle-deep-transmission-pan.html
The ATF+4 fluid will stay much cooler !
See Post # 10 in this link...
If you take a photo from rear of Jeep, & then look above at the rear differential cover, you will then see the pigtail with 2 wires inside the split loom tubing.
The rear differential speed sensor pigtail wiring, is responsible for rpm & tach issues. Needs to be either replaced or inspected for chaffed or broken wires.
Not that I can find the link, but 2011 KK Jeep liberty FSM mentions the correct Mopar tool for measuring the fluid level correctly.
It is based upon temperature & other perimeters.
The dealer or 2011 parts fiche may mention the shorter temporary correct dipstick part number.
I'd consider a flush and ensure you utilize ATF +4 transmission fluid.
In or around 2003 all KJ's came with ATF+4 installed by factory for power steering.
in post above you stated "Used the dealer brake fluid, (always) "
I'm sure you meant power steering fluid...?
2002 KJ's came with power steering fluid, is your KJ running with this or ATF+4 ?
Do you see any leaks around pump or lines caused by worn out seals or o rings?
Could it be that your 2002 KJ has air entering into the system via the power steering lines?
Have you ever added power steering fluid?
Note: With the 2002 KJ, most have been converted to red ATF+ 4 transmission fluid...
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