I didn't intend to go this long without a UOA, but... I haven't done anything to cause the copper to shoot up that I can think of. I had a small amount of sludge in my bypass filter canister. The oil looks good to me, but maybe 25K is to long on RTS. Thoughts? Link to my last UOA @ 16.5K the copper was only at 6ppm
Shell Rotella T 5W/40 (Syn) 3qt make up oil 25,000 Miles on the oil FS 2500 filter Ci-4 and Cj-4 mix
Copper increased considerably in the latest sample from your 2500. If you've had any brass/bronze
parts added to your engine, that may explain what we found. Regardless, this level makes the oil abrasive
so we suggest having it changed out. This may show a problem developing so we suggest resampling at
5,000 miles on the fresh oil to monitor. The oil itself was in good shape physically and was free of any
harmful contaminants. The TBN is still strong at 6.2 so there is no lack of active additive in this oil.
Hopefully copper improves with the oil change.
ALUMINUM 4
CHROMIUM 2
IRON 50
COPPER 378
LEAD 3
TIN 1
MOLYBDENUM 21
NICKEL 1
MANGANESE 1
SILVER 0
TITANIUM 0
POTASSIUM 2
BORON 34
SILICON 11
SODIUM 3
CALCIUM 3109
MAGNESIUM 209
PHOSPHORUS 1280
ZINC 1642
BARIUM 0
cSt Viscosity @ 100°C 75.1
SUS Viscosity @ 210°F 14.27
Flashpoint in °F 420
Fuel % Antifreeze % 0.0
Water % 0.0
Insolubles % 0.3
TBN 6.2
Shell Rotella T 5W/40 (Syn) 3qt make up oil 25,000 Miles on the oil FS 2500 filter Ci-4 and Cj-4 mix
Copper increased considerably in the latest sample from your 2500. If you've had any brass/bronze
parts added to your engine, that may explain what we found. Regardless, this level makes the oil abrasive
so we suggest having it changed out. This may show a problem developing so we suggest resampling at
5,000 miles on the fresh oil to monitor. The oil itself was in good shape physically and was free of any
harmful contaminants. The TBN is still strong at 6.2 so there is no lack of active additive in this oil.
Hopefully copper improves with the oil change.
ALUMINUM 4
CHROMIUM 2
IRON 50
COPPER 378
LEAD 3
TIN 1
MOLYBDENUM 21
NICKEL 1
MANGANESE 1
SILVER 0
TITANIUM 0
POTASSIUM 2
BORON 34
SILICON 11
SODIUM 3
CALCIUM 3109
MAGNESIUM 209
PHOSPHORUS 1280
ZINC 1642
BARIUM 0
cSt Viscosity @ 100°C 75.1
SUS Viscosity @ 210°F 14.27
Flashpoint in °F 420
Fuel % Antifreeze % 0.0
Water % 0.0
Insolubles % 0.3
TBN 6.2
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