498 miles on the oil
83368 miles on the engine
Bought this car with just over 80k miles on it and a few thousand left on the most recent oil change. Previous owner had used Shell Helix Ultra Racing 10W-60.
I had the rod bearings changed preventatively (rod bearing wear is a known issue with this engine). At that time, the oil was replaced with BMW TwinPower Turbo 10W-60, which I am continuing to use. The shop advised me that a 500 mile OCI was probably-not-necessary-but-advisable-and-harmless after a rod bearing change, so I did that. This sample is from that OCI.
Not sure where the lead is coming from. Anyone think it could be left over from the old rod bearings? They were lead/copper and rather worn (new ones are apparently aluminum/tin). That was two OCIs ago, though. Man, do I hope it's not from the main bearings...
Pretty sure the fuel dilution was from cold running due to a failing thermostat (just replaced), plus a fair number of short trips.
Copying the numbers here because Polaris's reports are kind of annoying to read:
Iron - 5
Chromium - 0
Nickel - 0
Aluminum - 1
Copper - 0
Lead - 8
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Silicon - 4
Sodium - 4
Potassium - 1
Titanium - 1
Molybdenum - 54
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 60
Magnesium - 26
Calcium - 2499
Barium - 0
Phosphorus - 861
Zinc - 961
Fuel Dilution - 1.8% (by GC)
Soot - Water -
Viscosity @ 100º C - 18.6
TBN - 7.06
Oxidation - 9
Nitration - 9
83368 miles on the engine
Bought this car with just over 80k miles on it and a few thousand left on the most recent oil change. Previous owner had used Shell Helix Ultra Racing 10W-60.
I had the rod bearings changed preventatively (rod bearing wear is a known issue with this engine). At that time, the oil was replaced with BMW TwinPower Turbo 10W-60, which I am continuing to use. The shop advised me that a 500 mile OCI was probably-not-necessary-but-advisable-and-harmless after a rod bearing change, so I did that. This sample is from that OCI.
Not sure where the lead is coming from. Anyone think it could be left over from the old rod bearings? They were lead/copper and rather worn (new ones are apparently aluminum/tin). That was two OCIs ago, though. Man, do I hope it's not from the main bearings...
Pretty sure the fuel dilution was from cold running due to a failing thermostat (just replaced), plus a fair number of short trips.
Copying the numbers here because Polaris's reports are kind of annoying to read:
Iron - 5
Chromium - 0
Nickel - 0
Aluminum - 1
Copper - 0
Lead - 8
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0
Silicon - 4
Sodium - 4
Potassium - 1
Titanium - 1
Molybdenum - 54
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 60
Magnesium - 26
Calcium - 2499
Barium - 0
Phosphorus - 861
Zinc - 961
Fuel Dilution - 1.8% (by GC)
Soot - Water -
Viscosity @ 100º C - 18.6
TBN - 7.06
Oxidation - 9
Nitration - 9