Since the oil analysis showed fuel in the oil, that says it is highly probably you have a leaking or sticking fuel injector. If it gets bad enough it will ruin the compression quickly on that cylinder!!!!! Or you have a bad plug(s) or wire(s) that are not getting a hot enough spark on one or more cylinders.
I would pull the injectors and clean and test them. Same for the spark plugs, wires, and the cap and rotor!!!!!
Small coolant in the oil leaks may be reduced by adding bars leaks brown fiber pellets to the coolant. They are dry, you crumble them and add them to the radiator.
If too much unburned fuel is getting past the combustion chamber a good, working O2 sensor might also see too little O2, and compensate by adding O2, thus resulting in an increased idle.
Here's my first report:
Unit ID: 2000 Jeep Cherokee
Second ID: Inline 6
Unit Type: Unleaded Gasoline Engine
Application: Transportation
Unit Mileage: 171,673
Lubricant Mileage: 2,113
Lubricant: Amsoil XLT SAE Synthetic 10W30
OVERALL SEVERITY OF REPORT: (High end of ABNORMAL)
SUGGEST performing cooling system pressure check. Lubricant and filter change is suggested if not done at sampling time. Coolant indicators (Sodium, Potassium) are at a significant level. Flagged additive levels are different than what should be present for the lubricant that is identified for this unit. Please provide unit model number so we may compare data to the proper standards for this unit; Replace oil filter and top off system with fresh make-up oil if not done when oil sample was taken. Re-sample in 3,500 miles or 65 hours. Resample in 30 days.
Areas that are flagged:
CONTAMINANT METALS:
Sodium: 41 PPM (High end of NORMAL)
Potassium: 197 PPM (High end of ABNORMAL)
MULTI-SOURCE METALS:
Molybdenum: 8 PPM (Low end of ABNORMAL)
Manganese: 27 PPM (High end of NORMAL)
Boron: 41 PPM (Low end of ABNORMAL)
ADDITIVE METALS:
Magnesium: 584 PPM (Low end of ABNORMAL)
Zinc: 1063 PPM (Low end of ABNORMAL)
Here is my second report:
Unit Mileage: 174,257
Lubricant Mileage: 2,358
Lubricant: Amsoil XLT SAE Synthetic 10W30
OVERALL SEVERITY OF REPORT: (Critical)
Check for source of FUEL LEAK (injectors, lines, etc.). Fuel is at a SIGNIFICANT LEVEL; Lubricant and filter change is suggested if not done at sampling time; FUEL DILUTION has caused viscosity to decrease SEVERELY; MODERATE POTASSIUM level could be a coolant indicator; Coolant leaks at this level will most likely not be detectable through normal diagnostics; Suggest MONITORING COOLANT LEVEL closely between samples; Magnesium is slightly high for this lubricant; Please provide until model number so we can compare data to the proper standards for this unit; Resample at half intervals.
CONTAMINANT METALS:
Sodium: 14 PPM (NORMAL)
Potassium: 45 PPM (Low end of ABNORMAL)
MULTI-SOURCE METALS:
Molybdenum: 36 PPM (NORMAL)
Manganese: 6 PPM (NORMAL)
Boron: 198 PPM (NORMAL)
ADDITIVE METALS:
Magnesium: 92 PPM (Low end of ABNORMAL)
Zinc: 757 PPM (NORMAL)
Fuel: 3.6% (High end of ABNORMAL)
Viscosity 9.0 (Critical)