Wanting to replace the spark plugs, wiring, oil and fliter in my 2.5L just not sure on what to get. Any recommendations? I bought it used so I do not know what condition everything is in, want to do it so I know what is in my vehicle. There is just under 150K miles on the Jeep.
Three good plugs for any 2.5L and '99 and older 4.0L engines include the 100k mile platinum Autolite AP985 or Champion 3034 plugs. Or the 200k mile iridium tipped Autolite XP985.
When replacing your distributor cap & rotor, try to find with brass contacts. Cheaper caps & rotors have aluminum contacts which don't last as long.
For ignition wiring, too many aftermarket wiring sets are shoddily made/fall apart when replacing plugs. Also, many cause lots of spark/ignition noise (static). This is one of those parts I only recommend the factory replacement for. Especially avoid those so-called "low resistance" wiring sets. While 'low resistance' sounds good, that is a misleading term that doesn't work the way it sounds like it would. Resistance is actually added at extra cost to ignition wiring to eliminate static & interference to the engine computer. Due to how electricity flows (Ohm's Law & all that), the added resistance does not really reduce the spark voltage in a significant manner.
Finally, your engine doesn't require anything special on oil...just regular oil & filter changes will keep it happy & healthy. 5W-30 or 10W-30 is all you need. While I prefer synthetic lubes in my transmission, power steering, & transfer case, I run/prefer conventional lubes in my engine & axles.
__________________ When you have a choice, buy American.
Here is what I use
Plugs: Champion or Autolite (I have had the best results with standard copper plugs)
Wires: Autolite Professional
Cap & rotor: BWD (lifetime warranties on both)
Filter: Purolator PureOne (orange box is bad imo)
Transmission: (manual) Redline MT-90
Transfercase: Good quality ATF+4
Diffs: Good quality synthetic oil with friction modifier in rear(usually Royal Purple or Mobil1)
I also use only the highest quality unicorn tears for my blinker fliud.
Just my 2 cents