fresh oil reference values taken from http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=11;t=000095 a VOA of all the M1's sent to the same lab as my sample (Blackstone Labs) TBN is a guesstimate from other M1 VOA's of different weights I could only find one 1 M1 10-30 voa and is was kinda old (feb of 03) not sure if has changed since then? http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=11;t=000068#000000 realy I guess what it started with not important as long as there is some left when I chenge the oilcode:
EQUIPMENT MAKE: GM
EQUIPMENT MODEL: 8.1L 496 CI V-8
FUEL TYPE: Gasoline (Unleaded)
OIL USE INTERVAL: 6,692 Miles
OIL TYPE & GRADE: Mobil 1 10W/30 (Gas)
MAKE-UP OIL ADDED: 1 qt
REPORT DATE: 10/16/03
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COMMENTS:
RAVEN: Since you're not using any additives & the engine hasn't been opened since it was new, the
high lead we found must be coming from your bearings. Is the engine running okay? We would not
normally talk about 8 ppm sodium, but perhaps it shows a slight coolant seep. The lead is coming from
your bearings -- we just can't say for sure why. The TBN read 5.3, strong, but we don't suggest
running the oil any longer than this until we know why lead is high. Check back @ 3000 miles
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MI/HR ON OIL 6,692 7/7/03 to 10/2/03)
MI/HR ON UNIT 45,904 MI/1229HR
SAMPLE DATE 9/2/03
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this sample fresh oil
TBN 5.3 10-12.5
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ALUMINUM 4 0
CHROMIUM 1 0
IRON 26 1
COPPER 5 0
LEAD 51 0
TIN 4 0
MOLYBDENUM 93 69
NICKEL 1 0
MANGANESE 0 0
SILVER 0 0
TITANIUM 0 0
POTASSIUM 2 0
BORON 159 190
SILICON 8 3
SODIUM 8 9
CALCIUM 3609 2976
MAGNESIUM 31 16
PHOSPHORUS 920 749
ZINC 1155 827
BARIUM 0 0
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sus viscosity@
210˚f 65.4 58.3
flash point 365f 390f
fuel% 0.5 No Data
antifreze% 0 No Data
water% 0.0 No Data
insoluables% 0.3 No Data
oil capacity is 7QT +1 makeup so we are talking about 2gallons of oil total. that is a lot of oil to dilute that wear metal into but then again it is a large engine with a lot of metal to wear not sure how to look at that, unfortunately there are not other UOA's on this Engine that I can find, its closest sibling is the 454 (7.4L) but it is a complete redesign not sure if the bearings are similar
I did find one 454 report http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=3;t=000164 it's lead was low at 11PPM and it even had an internal coolant leak and it has less bearing wear than mine
I use ACdelco “duraguard gold” filters witch are suppose to be excellent in both flow and filtration thanks to synthetic media, but unfortunately no longer made in my size. My stock of them is running low. this was only suppose to be a baseline for experiments with other filters. air filter was changed in the middle of the OCI insolubles and silicon look ok so that is not a source of the problem
Like a lot of other Chevy “vortec” engines this one has cold start knock and has since 250 miles (a few mornings after I bought it) hut that was suppose to be a piston and piston bore problem the piston is aluminum the block head and rings are steel/, iron and aluminum in the report are acceptable, I have been on a lot of chevy/chevy truck forums this is the first I have heard of bearing problems
the tuck is used mainly for a commuter I live 35miles from work almost all of it freeway and highway, it is 15 miles into town so no short trips here, it sees occasionally sees heavy towing, and did once on this OCI, I hauled a Toyota truck on a tailer to east Tennessee and back again almost all highway, this is suppose to be a heavy duty truck should have taken that trip with no complaints
Never though I would have bearing problems @ less than 50K, truck is not even payed for yet but out of warranty
I am a mechanic by trade but not automotive, this is the first time I have dealt with oil analysis and I an not sure what to do about the bearing wear? Is this bearing going to fail immediately? Can you even tell that from a reort? Should I drop the pan and have a look or watch it for the next 2,000 miles and take another sample?
[ October 16, 2003, 06:20 PM: Message edited by: RavenTai ]