Previous UOA here.
142308 miles on the engine at the time of this sample.
Shortly after the beginning of this OCI, the car registered misfires on all bank 2 cylinders, throwing the car into limp mode. Ended up driving it (gently) with that problem recurring periodically for somewhere between 100 and 200 miles before swapping in a new primary O2 sensor seemed to fix the issue. The car still ran slightly rough afterward, so I ran a bottle of Liqui Moly Fuel System Cleaner in one tank (couldn’t tell if it helped). Over the next few hundred miles, everything returned to normal.
Close to the end of the OCI, I had the bank 1 valve cover and oil filter housing gasket replaced. Figured there was significant potential for dirt ingress during those repairs, so I drove mildly and ran another bottle of Liqui Moly Fuel System Cleaner before draining the oil ~550 miles after the repairs.
Given all that, I imagined I'd see record-breaking fuel dilution, elevated silicon levels, and potentially elevated wear metal numbers. Not sure if I should be happy or puzzled that none of those panned out...
Wear Metals
Iron - 8
Chromium - 0
Nickel - 0
Aluminum - 1
Copper - 2
Lead - 1
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 11
Contaminant Metals
Silicon - 8
Sodium - 3
Potassium - 1
Multi-Source Metals
Titanium - 44
Molybdenum - 187
Antimony - 4
Manganese - 0
Lithium - 1
Boron - 33
Additive Metals
Magnesium - 18
Calcium - 2982
Barium - 0
Phosphorus - 859
Zinc - 1006
Other Contaminants
Fuel Dilution - 2.0% (GC)
Soot - Water -
Fluid Properties
Viscosity @ 100º C - 19.5 cSt
TBN - 5.04
Oxidation - 14
Nitration - 11
142308 miles on the engine at the time of this sample.
Shortly after the beginning of this OCI, the car registered misfires on all bank 2 cylinders, throwing the car into limp mode. Ended up driving it (gently) with that problem recurring periodically for somewhere between 100 and 200 miles before swapping in a new primary O2 sensor seemed to fix the issue. The car still ran slightly rough afterward, so I ran a bottle of Liqui Moly Fuel System Cleaner in one tank (couldn’t tell if it helped). Over the next few hundred miles, everything returned to normal.
Close to the end of the OCI, I had the bank 1 valve cover and oil filter housing gasket replaced. Figured there was significant potential for dirt ingress during those repairs, so I drove mildly and ran another bottle of Liqui Moly Fuel System Cleaner before draining the oil ~550 miles after the repairs.
Given all that, I imagined I'd see record-breaking fuel dilution, elevated silicon levels, and potentially elevated wear metal numbers. Not sure if I should be happy or puzzled that none of those panned out...
Wear Metals
Iron - 8
Chromium - 0
Nickel - 0
Aluminum - 1
Copper - 2
Lead - 1
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 11
Contaminant Metals
Silicon - 8
Sodium - 3
Potassium - 1
Multi-Source Metals
Titanium - 44
Molybdenum - 187
Antimony - 4
Manganese - 0
Lithium - 1
Boron - 33
Additive Metals
Magnesium - 18
Calcium - 2982
Barium - 0
Phosphorus - 859
Zinc - 1006
Other Contaminants
Fuel Dilution - 2.0% (GC)
Soot - Water -
Fluid Properties
Viscosity @ 100º C - 19.5 cSt
TBN - 5.04
Oxidation - 14
Nitration - 11
