Previous UOA here. 129808 miles on the engine at the time of sampling (minor typo in the report).
1x 2-day track event on this oil (NJMP Lightning, intermediate pace, street tires). Also, a few exhaust leaks and minor emissions system gremlins found and fixed, hence the marginally earlier change; once I saw the problems, I realized I might have been dumping a bunch of contaminants in the oil for who-knows-how-long, so I wanted to get the oil out of there and start fresh. If the fuel dilution number in this report is any indication, maybe I was right.
Seems like the formulation has changed. BMW recently announced a switch from Shell back to Castrol for engine lubricants so maybe that's where the Ti and higher Mo are coming from. Different wear metals profile, too. Starting to wonder if I now have to throw out most of my UOA history. Ugh.
In the pic, ignore the anomalously low fuel dilution reading on the earliest visible sample. It was not reliable.
Wear Metals
Iron - 6
Chromium - 0
Nickel - 0
Aluminum - 1
Copper - 2
Lead - 2
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 11
Contaminant Metals
Silicon - 6
Sodium - 3
Potassium - 1
Multi-Source Metals
Titanium - 36
Molybdenum - 166
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 33
Additive Metals
Magnesium - 18
Calcium - 2816
Barium - 0
Phosphorus - 809
Zinc - 986
Other Contaminants
Fuel Dilution - 2.6% (GC)
Soot - <0.1% by vol.
Water - <0.1% by vol. (FTIR)
Fluid Properties
Viscosity @ 100º C - 19.4 cSt
TBN - 5.23
Oxidation - 13
Nitration - 10
1x 2-day track event on this oil (NJMP Lightning, intermediate pace, street tires). Also, a few exhaust leaks and minor emissions system gremlins found and fixed, hence the marginally earlier change; once I saw the problems, I realized I might have been dumping a bunch of contaminants in the oil for who-knows-how-long, so I wanted to get the oil out of there and start fresh. If the fuel dilution number in this report is any indication, maybe I was right.
Seems like the formulation has changed. BMW recently announced a switch from Shell back to Castrol for engine lubricants so maybe that's where the Ti and higher Mo are coming from. Different wear metals profile, too. Starting to wonder if I now have to throw out most of my UOA history. Ugh.
In the pic, ignore the anomalously low fuel dilution reading on the earliest visible sample. It was not reliable.
Wear Metals
Iron - 6
Chromium - 0
Nickel - 0
Aluminum - 1
Copper - 2
Lead - 2
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Particle Quantifier (PQ) Index - 11
Contaminant Metals
Silicon - 6
Sodium - 3
Potassium - 1
Multi-Source Metals
Titanium - 36
Molybdenum - 166
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 33
Additive Metals
Magnesium - 18
Calcium - 2816
Barium - 0
Phosphorus - 809
Zinc - 986
Other Contaminants
Fuel Dilution - 2.6% (GC)
Soot - <0.1% by vol.
Water - <0.1% by vol. (FTIR)
Fluid Properties
Viscosity @ 100º C - 19.4 cSt
TBN - 5.23
Oxidation - 13
Nitration - 10
Last edited by a moderator:
