First time doing a UOA. 1993 Toyota Tercel at 295,143 KM. I rebuilt the motor at 190,000km due to neglect by the previous owner, so it has a bit over 100,000KM on rebuild. I have used Formula Shell exclusively since that time, with at least the last 5 changes being with the SN variety. I did 5000KM changes for years but have recently extended it and finally got up to around 10,000km this time(about 6200 miles). Around 9 months on this change.
I drive reasonably but sometimes with a bit of aggression. Probably about 50/50 city and highway driving.
I used a Napa Proselect filter on this change and have done so for a number of changes. I used to use the Gold but the old Tercel seems to get less and less TLC nowadays.
Blackstone comments:
A few things were out of line here, but only silicon is worth talking about at length. It might show a
dirty air filter, so we suggest inspecting that system closely. If it is dirt, then that could explain the mildly high
levels of wear. Universal averages show typical wear levels for this type of engine after about 10,000 km
use on the oil. Not all engines wear exactly like our averages show, so if silicon isn't from abrasive dirt,
these readings may just be normal. The trace of fuel isn't a concern, but the TBN was fairly low at 0.2, so
not much active additive was left
Code:
Oil FS 10w30 SN
KM In use 9.7K
KM 295,143
Sample Taken 08/09/2012 AVG
Aluminum 5 3
Chromium 2 0
Iron 19 9
Copper 6 2
Lead 7 1
Tin 3 1
Molybdenum 81 81
Nickel 1 0
Manganese 1 0
Silver 0 0
Titanium 0 1
Potassium 0 3
Boron 37 41
Silicon 64 15
Sodium 14 26
Calcium 2590 2422
Magnesium 10 91
Phosphorus 820 842
Zinc 1029 855
Barium 0 0
SUS Viscosity @ 210 63.3 59-65
cST Viscosity @ 100 11.13 9.9-11.9
Flashpoint 375 >375
Fuel Trace
Antifreeze 0 0
Water 0
Insolubles 0.4
TBN 0.2 >1.0
Clearly the oil was spent. I'll probably try 8,000km this time and see what happens. I had a good look at the air intake and, sure enough, the back side has a hole where there should be some sort of grommet or plug. I'll try to patch that up asap and hopefully it will lower the silicon reading. Whether or not that accounts for the higher iron readings I can't be sure but I'll probably do another UOA or two to see how things go. It doesn't make financial sense on an old Tercel but I'd like to do it to satisfy my curiosity.
I drive reasonably but sometimes with a bit of aggression. Probably about 50/50 city and highway driving.
I used a Napa Proselect filter on this change and have done so for a number of changes. I used to use the Gold but the old Tercel seems to get less and less TLC nowadays.
Blackstone comments:
A few things were out of line here, but only silicon is worth talking about at length. It might show a
dirty air filter, so we suggest inspecting that system closely. If it is dirt, then that could explain the mildly high
levels of wear. Universal averages show typical wear levels for this type of engine after about 10,000 km
use on the oil. Not all engines wear exactly like our averages show, so if silicon isn't from abrasive dirt,
these readings may just be normal. The trace of fuel isn't a concern, but the TBN was fairly low at 0.2, so
not much active additive was left
Code:
Oil FS 10w30 SN
KM In use 9.7K
KM 295,143
Sample Taken 08/09/2012 AVG
Aluminum 5 3
Chromium 2 0
Iron 19 9
Copper 6 2
Lead 7 1
Tin 3 1
Molybdenum 81 81
Nickel 1 0
Manganese 1 0
Silver 0 0
Titanium 0 1
Potassium 0 3
Boron 37 41
Silicon 64 15
Sodium 14 26
Calcium 2590 2422
Magnesium 10 91
Phosphorus 820 842
Zinc 1029 855
Barium 0 0
SUS Viscosity @ 210 63.3 59-65
cST Viscosity @ 100 11.13 9.9-11.9
Flashpoint 375 >375
Fuel Trace
Antifreeze 0 0
Water 0
Insolubles 0.4
TBN 0.2 >1.0
Clearly the oil was spent. I'll probably try 8,000km this time and see what happens. I had a good look at the air intake and, sure enough, the back side has a hole where there should be some sort of grommet or plug. I'll try to patch that up asap and hopefully it will lower the silicon reading. Whether or not that accounts for the higher iron readings I can't be sure but I'll probably do another UOA or two to see how things go. It doesn't make financial sense on an old Tercel but I'd like to do it to satisfy my curiosity.
