2010 Jeep Commander 5.7 Hemi
A few weeks ago I posted about running my vehicle without an air filter for an unknown amount of time when my aftermarket air intake slid off the tb. About a week after I noticed the issue I did an Oil change and sent a sample to Blackstone. The oil had slightly less than 5 months on it. Ironically, the silicone was low. The wear metals however, especially the iron, were high. The numbers were equivalent to an engine that'd run its oil for 5800 miles. I only put about 1,000 on mine.
Just some background on my situation - the truck has around 25K miles. OCIs are usually every 6 months, around 1500 miles per. Lots of short trips - (2) 2 mile runs daily, 5 days a week, so the engine rarely gets fully warmed up. The oil was PP 5w-20.
Code:
MI on Oil 1,000
MI on Unit 25,700
Sample Date 03/05/14
Make Up Oil Added 0 quarts
Universal Avgs
ALUMINUM 2 2
CHROMIUM 0 1
IRON 21 19
COPPER 35 41
LEAD 0 1
TIN 0 1
MOLYBDENUM 56 77
NICKEL 0 1
MANGANESE 1 1
SILVER 0 0
TITANIUM 0 0
POTASSIUM 3 2
BORON 16 49
SILICON 3 8
SODIUM 3 49
CALCIUM 2168 2011
MAGNESIUM 12 185
PHOSPHORUS 690 833
ZINC 773 797
BARIUM 0 0
SUS Viscosity @ 210°F 51.0
cSt Viscosity @ 100°C 7.56
Flashpoint in °F 395
Fuel %
Antifreeze % 0.0
Water % 0.0
Insolubles 0.2
TBN 2.8
Here's the comment from Blackston: We typically look for dirt in the amount of silicon present in a sample of oil. Silicon read pretty low here, so it doesn't look like too much dirt got into your engine. Wear metals do seem a little high, though, for just 1,000 miles. Universal averages show typical wear levels for the 5.7L Hemi engine (if your Commander
is the 3.7L or 4.7L version, let us know) after ~5,800 miles. Iron, from steel parts, is a bit high. Maybe this is residual from last time, if you've been using long oil runs. Insolubles were low, and the viscosity was fine. Check back after a normal interval.
So i'm having a bit of trouble understanding this. Since the Silicone is so low, how come the wear is so high? Can it be that its not attributed to ingesting unfiltered air? Can my short trips be also responsible for this? There is no fuel in the oil but this could be because I took a long drive to warm up the oil before the change. Im pretty sure there is fuel dilution during the week since the car never warms up. Sometime i can go 2-3 weeks before taking a single long drive to fully warm up the motor. Anyways appreciate all responses.
A few weeks ago I posted about running my vehicle without an air filter for an unknown amount of time when my aftermarket air intake slid off the tb. About a week after I noticed the issue I did an Oil change and sent a sample to Blackstone. The oil had slightly less than 5 months on it. Ironically, the silicone was low. The wear metals however, especially the iron, were high. The numbers were equivalent to an engine that'd run its oil for 5800 miles. I only put about 1,000 on mine.
Just some background on my situation - the truck has around 25K miles. OCIs are usually every 6 months, around 1500 miles per. Lots of short trips - (2) 2 mile runs daily, 5 days a week, so the engine rarely gets fully warmed up. The oil was PP 5w-20.
Code:
MI on Oil 1,000
MI on Unit 25,700
Sample Date 03/05/14
Make Up Oil Added 0 quarts
Universal Avgs
ALUMINUM 2 2
CHROMIUM 0 1
IRON 21 19
COPPER 35 41
LEAD 0 1
TIN 0 1
MOLYBDENUM 56 77
NICKEL 0 1
MANGANESE 1 1
SILVER 0 0
TITANIUM 0 0
POTASSIUM 3 2
BORON 16 49
SILICON 3 8
SODIUM 3 49
CALCIUM 2168 2011
MAGNESIUM 12 185
PHOSPHORUS 690 833
ZINC 773 797
BARIUM 0 0
SUS Viscosity @ 210°F 51.0
cSt Viscosity @ 100°C 7.56
Flashpoint in °F 395
Fuel %
Antifreeze % 0.0
Water % 0.0
Insolubles 0.2
TBN 2.8
Here's the comment from Blackston: We typically look for dirt in the amount of silicon present in a sample of oil. Silicon read pretty low here, so it doesn't look like too much dirt got into your engine. Wear metals do seem a little high, though, for just 1,000 miles. Universal averages show typical wear levels for the 5.7L Hemi engine (if your Commander
is the 3.7L or 4.7L version, let us know) after ~5,800 miles. Iron, from steel parts, is a bit high. Maybe this is residual from last time, if you've been using long oil runs. Insolubles were low, and the viscosity was fine. Check back after a normal interval.
So i'm having a bit of trouble understanding this. Since the Silicone is so low, how come the wear is so high? Can it be that its not attributed to ingesting unfiltered air? Can my short trips be also responsible for this? There is no fuel in the oil but this could be because I took a long drive to warm up the oil before the change. Im pretty sure there is fuel dilution during the week since the car never warms up. Sometime i can go 2-3 weeks before taking a single long drive to fully warm up the motor. Anyways appreciate all responses.