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Old 02-03-2012, 12:56 PM
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High metals count in oil

I just got the oil assay report back from Blackstone Labs for my new(to me)
'04 WJ 4.7. With approx 4K miles on the oil and filter:

Aluminum 9 vs. 4 universal averages
Chromium 2 vs. 1 "
Iron 45 vs. 15 "
Copper 8 vs. 3 "
Lead 0 vs. 1 "
Silicon 8 vs. 9
No antifreeze or water in the oil and all other numbers within "average" or better.
Aluminum could indicate piston scuffing.
Chromium could indicate ring wear as could high iron, however low silicon
would indicate that the air filter is working properly.
Copper could possibly be bearings, but with no lead, it's doubtful the bearings
are going bad. So the question is, what else in this 4.7 could be wearing
causing high aluminum, iron, chromium and copper? I'm unfamiliar
with this generation of single overhead cam engines. Are there brass/bronze
bushings that could be a source for the copper?
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Old 02-12-2012, 06:42 PM
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I'm not exactly sure what could be causing the high metals, but if there are no other signs of a problem I would change the oil and get it analyzed again, it could be an anomaly.
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Old 03-12-2012, 08:44 PM
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Re: High metals count in oil

Dude - check the compression on each cylinder and see if you have a ring problem It sounds to me like the rings/pistons are wacked out.
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