Previous UOA here.
165296 miles on the engine at the time of this sample.
Did this change a bit earlier than normal because I had a gap in my schedule and didn't know if I'd have one later. Changed spark plugs ~370 miles before draining the oil.
A little more than halfway through this OCI, I switched to Shell fuel almost exclusively and tried to get back to a driving style that had reduced oil consumption for me in the past: basically minimizing time spent at part throttle in the middle of the RPM range, so always trying to keep RPMs low except for rare moments of flooring it and chasing the redline.
Could be a coincidence, but oil consumption did seem to improve slightly and iron and aluminum numbers are the lowest they've been in a while. Fuel dilution is down, too. When I saw the numbers, I thought they had to be anomalies. But I took the sample when the sump was almost a quart low – so, all else equal, the wear metals should be more concentrated, not less. Additive numbers are all about the same as they've been, as is the copper number (not sure what to make of the latter, if anything).
I'm gonna keep sticking with Shell fuel and that all-or-nothing driving strategy, and maybe keep the OCIs at or below 5k, and see if the good news keeps coming.
Also think I'm gonna stop wasting my time trying to get the lab not to flag Ti in this oil. They acknowledge my note that it must be an additive but still flagged it. #ShrugLife
Wear Metals
Iron - 5
Chromium - 0
Nickel - 0
Aluminum - 2
Copper - 3
Lead - 0
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 11
Contaminant Metals
Silicon - 3
Sodium - 3
Potassium - 2
Multi-Source Metals
Titanium - 48
Molybdenum - 195
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 30
Additive Metals
Magnesium - 17
Calcium - 3053
Barium - 0
Phosphorus - 891
Zinc - 1023
Other Contaminants
Fuel Dilution - 1.4% (GC)
Soot - <0.1%
Water - <0.1% (FTIR)
Fluid Properties
Viscosity @ 100º C - 19.8 cSt
TBN - 4.76
Oxidation - 14
Nitration - 10
165296 miles on the engine at the time of this sample.
Did this change a bit earlier than normal because I had a gap in my schedule and didn't know if I'd have one later. Changed spark plugs ~370 miles before draining the oil.
A little more than halfway through this OCI, I switched to Shell fuel almost exclusively and tried to get back to a driving style that had reduced oil consumption for me in the past: basically minimizing time spent at part throttle in the middle of the RPM range, so always trying to keep RPMs low except for rare moments of flooring it and chasing the redline.
Could be a coincidence, but oil consumption did seem to improve slightly and iron and aluminum numbers are the lowest they've been in a while. Fuel dilution is down, too. When I saw the numbers, I thought they had to be anomalies. But I took the sample when the sump was almost a quart low – so, all else equal, the wear metals should be more concentrated, not less. Additive numbers are all about the same as they've been, as is the copper number (not sure what to make of the latter, if anything).
I'm gonna keep sticking with Shell fuel and that all-or-nothing driving strategy, and maybe keep the OCIs at or below 5k, and see if the good news keeps coming.
Also think I'm gonna stop wasting my time trying to get the lab not to flag Ti in this oil. They acknowledge my note that it must be an additive but still flagged it. #ShrugLife
Wear Metals
Iron - 5
Chromium - 0
Nickel - 0
Aluminum - 2
Copper - 3
Lead - 0
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 11
Contaminant Metals
Silicon - 3
Sodium - 3
Potassium - 2
Multi-Source Metals
Titanium - 48
Molybdenum - 195
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 30
Additive Metals
Magnesium - 17
Calcium - 3053
Barium - 0
Phosphorus - 891
Zinc - 1023
Other Contaminants
Fuel Dilution - 1.4% (GC)
Soot - <0.1%
Water - <0.1% (FTIR)
Fluid Properties
Viscosity @ 100º C - 19.8 cSt
TBN - 4.76
Oxidation - 14
Nitration - 10
