Previous UOA here. Now at 110107 miles on the engine.
Ignore the "fluid added" quantity. Consumption has jumped to ~1 L / 1500 mi, which is roughly where it was when I bought the car with leaking valve cover gaskets. I fixed those (which cut consumption in half) and haven't noticed other leaks, though I have noticed what look like traces of oil on some of my spark plugs (pic attached).
PCV system is another suspect. Had a BMW crankcase pressure test done recently and was right in the middle of the normal range, though that was only at idle. On this engine, that includes oil separators that condense oil out of the crankcase vapor and drop it back into the sump. A while back, I was advised to replace those separators preventatively just based on mileage. I didn't then, but decided to do it this time to see if it helped the consumption. Wanted to replace the PCV valve as well, even though it's not known to go bad on this engine, but it's in a horrible location and I chickened out.
Fuel dilution is at its highest level to date. Maybe leaky injector(s) plus lots of downtime due to COVID, and maybe that's causing the consumption? Hoping it's something like that rather than blow-by causing both the dilution and the consumption. I'd rather not think about shelling out for a rebuild on this engine....
Copying the numbers here because I don't like how Polaris's reports are formatted:
Wear Metals
Iron -7
Chromium - 0
Nickel - 0
Aluminum - 3
Copper - 2
Lead - 0
Tin - 1
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 12
Contaminant Metals
Silicon - 7
Sodium - 4
Potassium - 1
Multi-Source Metals
Titanium - 0
Molybdenum - 52
Antimony - 1
Manganese - 0
Lithium - 0
Boron - 53
Additive Metals
Magnesium - 23
Calcium - 2458
Barium - 0
Phosphorus - 824
Zinc - 935
Other Contaminants
Fuel Dilution - 2.1% (GC)
Soot - Water -
Fluid Properties
Viscosity @ 100º C - 18.3 cSt
TBN - 4.44
Oxidation - 12
Nitration - 11
Ignore the "fluid added" quantity. Consumption has jumped to ~1 L / 1500 mi, which is roughly where it was when I bought the car with leaking valve cover gaskets. I fixed those (which cut consumption in half) and haven't noticed other leaks, though I have noticed what look like traces of oil on some of my spark plugs (pic attached).
PCV system is another suspect. Had a BMW crankcase pressure test done recently and was right in the middle of the normal range, though that was only at idle. On this engine, that includes oil separators that condense oil out of the crankcase vapor and drop it back into the sump. A while back, I was advised to replace those separators preventatively just based on mileage. I didn't then, but decided to do it this time to see if it helped the consumption. Wanted to replace the PCV valve as well, even though it's not known to go bad on this engine, but it's in a horrible location and I chickened out.
Fuel dilution is at its highest level to date. Maybe leaky injector(s) plus lots of downtime due to COVID, and maybe that's causing the consumption? Hoping it's something like that rather than blow-by causing both the dilution and the consumption. I'd rather not think about shelling out for a rebuild on this engine....
Copying the numbers here because I don't like how Polaris's reports are formatted:
Wear Metals
Iron -7
Chromium - 0
Nickel - 0
Aluminum - 3
Copper - 2
Lead - 0
Tin - 1
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 12
Contaminant Metals
Silicon - 7
Sodium - 4
Potassium - 1
Multi-Source Metals
Titanium - 0
Molybdenum - 52
Antimony - 1
Manganese - 0
Lithium - 0
Boron - 53
Additive Metals
Magnesium - 23
Calcium - 2458
Barium - 0
Phosphorus - 824
Zinc - 935
Other Contaminants
Fuel Dilution - 2.1% (GC)
Soot - Water -
Fluid Properties
Viscosity @ 100º C - 18.3 cSt
TBN - 4.44
Oxidation - 12
Nitration - 11
Attachments
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