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      04-02-2020, 09:01 AM   #1057
IamFODI
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Originally Posted by Assimilator1 View Post
One theory (for some S65s at least), is that the wear occurs early on in the engine's life (mainly thinking for OEM bearings). Hence I would like to see the whole history, but I appreciate that very few people will .
This is certainly in line with Glyco's statement about bearings with tight clearances, and with what we see from low-mileage rod bearings.

I've also been wondering if this explains the slight Al bump in my second UOA that went away in subsequent analyses (i.e. that was from the new 702/703 bearings getting that initial smear).
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      04-02-2020, 09:10 AM   #1058
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Originally Posted by Assimilator1 View Post
Yea all oil changes ideally, appreciate that the 1st one will show high metals etc.
Would like to see trends from the start (from new engine &/or new bearings).

One theory (for some S65s at least), is that the wear occurs early on in the engine's life (mainly thinking for OEM bearings). Hence I would like to see the whole history, but I appreciate that very few people will .



The first analysis after internal engine work (or a new engine) is basically a throw-away. Even the second one is only of marginal use to simply validate that most of those break-in contaminants have been removed by changing the oil & filter.



The whole point of a UOA is to establish a baseline and then monitor deviations from that.


Here's just an example. It's not an S65, it's a Chevy LT1 (Corvette/Camaro/truck motor). Same concepts apply though.
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      04-02-2020, 12:56 PM   #1059
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Yea, but if the very 1st & 2nd oil change shows very high lead levels that would show a little support to the early wear idea (your Chevy's 1st oil report doesn't, it's surprisingly low! ).
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Collation of oil analysis reports with some rod bearing photos for the M3's S65 - Does oil analysis work?
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      04-03-2020, 10:04 AM   #1060
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Originally Posted by Assimilator1 View Post
Yea, but if the very 1st & 2nd oil change shows very high lead levels that would show a little support to the early wear idea (your Chevy's 1st oil report doesn't, it's surprisingly low! ).

Maybe, but my interest would be more around what level it stabilizes to by the 3rd or even 4th oil change...or even how long it takes to stabilize.


UOA isn't the end-all, be-all of engine health. Even Blackstone and Terry Dyson will tell you that.
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      04-03-2020, 12:32 PM   #1061
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Yea I know that, I take it you didn't notice the link in my sig then?

I'm more interested in the 1st couple of oil changes
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Collation of oil analysis reports with some rod bearing photos for the M3's S65 - Does oil analysis work?
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      07-07-2020, 07:06 PM   #1062
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Just got the oil report back for my 160,000km (100,000 miles) '08. The oil had 10,000 miles on it. Very high Lead and Copper. I use regular 94 octane gas.



It looks like I'm overdue for new bearings.....
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      07-07-2020, 07:20 PM   #1063
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Originally Posted by ekfc63 View Post
Just got the oil report back for my 160,000km (100,000 miles) '08. The oil had 10,000 miles on it. Very high Lead and Copper. I use regular 94 octane gas.



It looks like I'm overdue for new bearings.....
Yeah better change them soon...
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      07-13-2020, 06:12 PM   #1064
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Just got oil analysis back for my new-to-me 2008 M3. AFAIK, these are original bearings. Given the engine has 120k miles on it, an oil analysis is the first thing I did. Lead looks especially high and Silicon reads high as well. Only put ~600 miles on the car before oil analysis, only 93 octane and PO did not track car so no leaded fuel likely on this oil. Looks like I may start looking for a reputable shop to replace bearings... Thoughts?
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      07-13-2020, 06:34 PM   #1065
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Quote:
Originally Posted by scherlock View Post
Just got oil analysis back for my new-to-me 2008 M3. AFAIK, these are original bearings. Given the engine has 120k miles on it, an oil analysis is the first thing I did. Lead looks especially high and Silicon reads high as well. Only put ~600 miles on the car before oil analysis, only 93 octane and PO did not track car so no leaded fuel likely on this oil. Looks like I may start looking for a reputable shop to replace bearings... Thoughts?
Yep, get it done ASAP. That’d be a good call even if the report came back clean.

Also, have the intake and vacuum system checked for leaks, and make sure there’s a decent air filter in there.
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      08-06-2020, 12:34 PM   #1066
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Yea, I hope both you guys have done your bearings by now?
That pb level is likely trouble!
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Collation of oil analysis reports with some rod bearing photos for the M3's S65 - Does oil analysis work?
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