Got some strange numbers on this UOA from my J-D Diesel Gator; 24 HP Yanmar; 530 total hours; 100 hrs/1 year +/- on the CI-4+ RTS 5-40 oil; NAPA 1365 filter. Iron and silicon were both high, according to Blackstone. Really strange part is the last UOA on another 24 HP Yanmar in my X595 here http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1208985#Post1208985 also showed high silicon numbers. A dust infiltration problem at the RWEST compound?
One thing that may have impacted the numbers - I didn't get the sample mid-flow; the sample bottle rolled away, and while I was chasing it, most of the oil drained out - I just caught the very end of the drain. Could that have done it?
RON: The universal averages column shows typical wear from this type of engine after about 90 hours on the oil (I've shown UA's in red ). This oil was run 100 hours, so we can understand wear being a little higher than average, though chrome and iron are somewhat higher than they should be. The reason may be silicon, if the silicon is dirt.
Suggest checking out the air filtration system and changing the air filter if necessary. Hopefully fixing an issue there will clear up the high metals next time around. The TBN read 10.0, still a very strong reading.
UOA #1
MI/HR ON OIL: 100
MI/HR ON UNIT:530
DATE:8-23-08
ALUMINUM: 4 3
CHROMIUM: 7 2
IRON: 36 14
COPPER: 2 1
LEAD: 2 0
TIN: 0 0
MOLY: 9 33
NICKEL: 0 0
MANGANESE: 0 0
SILVER: 0 0
TITANIUM: 0 0
POTASSIUM: 2 1
BORON:10 41 ???
SILICON: 23 9
SODIUM: 3 2
CALCIUM: 3067 3219
MAGNESIUM: 13 98 ???
PHOSPHOROUS: 1217 1164
ZINC: 1387 1440
BARIUM: 0 0
SUS VISC. @210F: 69.9
Cst Visc. @100C:12.94
Flashpoint (F): 405
Fuel %: Antifreeze %: 0.0
Water %: 0.0
Insolubles %: 0.4
TBN: 10.0
TAN:
ISO Code:
I used RTS 5-40 again for the re-fill, with NAPA 1365 filter.
I'm curious about some of those numbers, especially the silicon. This is two UOA's in a row with high silicon numbers.
RON: The universal averages column shows typical wear from this type of engine after about 90 hours on the oil (I've shown UA's in red ). This oil was run 100 hours, so we can understand wear being a little higher than average, though chrome and iron are somewhat higher than they should be. The reason may be silicon, if the silicon is dirt.
Suggest checking out the air filtration system and changing the air filter if necessary. Hopefully fixing an issue there will clear up the high metals next time around. The TBN read 10.0, still a very strong reading.
UOA #1
MI/HR ON OIL: 100
MI/HR ON UNIT:530
DATE:8-23-08
ALUMINUM: 4 3
CHROMIUM: 7 2
IRON: 36 14
COPPER: 2 1
LEAD: 2 0
TIN: 0 0
MOLY: 9 33
NICKEL: 0 0
MANGANESE: 0 0
SILVER: 0 0
TITANIUM: 0 0
POTASSIUM: 2 1
BORON:10 41 ???
SILICON: 23 9
SODIUM: 3 2
CALCIUM: 3067 3219
MAGNESIUM: 13 98 ???
PHOSPHOROUS: 1217 1164
ZINC: 1387 1440
BARIUM: 0 0
SUS VISC. @210F: 69.9
Cst Visc. @100C:12.94
Flashpoint (F): 405
Fuel %: Antifreeze %: 0.0
Water %: 0.0
Insolubles %: 0.4
TBN: 10.0
TAN:
ISO Code:
I used RTS 5-40 again for the re-fill, with NAPA 1365 filter.
I'm curious about some of those numbers, especially the silicon. This is two UOA's in a row with high silicon numbers.
Last edited: