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  #11  
Old 05-28-2019, 07:58 PM
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I keep a small sample of oil from every oil change. If I ever notice anything out of the ordinary going on I can always send samples in for analysis, even going back in time.
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  #12  
Old 05-28-2019, 09:11 PM
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GalinHdz GalinHdz is offline
 
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Quote:
Originally Posted by Bavafa View Post
As Barrett has mentioned, it is most useful when it is done on a regular bases to see the trend. I have been doing it and I think it is worth it, small fee to catch things early if it was going to go south.
Remember this is about trends not absolute numbers. But there have been occasions where an issue was identified with oil analysis before a problem happened. When I was in the USAF as a RADAR technician we did periodic oil analysis on the massive electrical motor that rotated the RADAR antenna. One day we got a note they were sending us a replacement motor because the oil analysis showed a main bearing was failing. We replaced the motor and sent ours back to Depot. They later reported the analysis was correct and one of the main bearing was so bad it probably would not have lasted another month. Since then I have been sold on the program. Thankfully my airplane engine oil analysis has always come back normal. The way I see it the $12.30 I spend every 6months for oil analysis is an insignificant cost of airplane ownership. YMMV

Quote:
Originally Posted by Bavafa View Post
I use Blackstone and they have been great in providing useful info as what the report means.
FWIW I use Aviation Oil Analysis (AOA) by ALS Tribology instead. No real reason to use one over the other, just stick with whichever you start with. Remember it is all about establishing a trend so anything different quickly sticks out.


They also provide a graphic display of all the items for easy trend analysis. I just didn't want to upload all the graphs from each item.

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Last edited by GalinHdz : 05-29-2019 at 07:58 PM.
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  #13  
Old 05-29-2019, 03:43 AM
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catmandu catmandu is offline
 
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I consider it a tool in the box. Like the official Lycoming position says, don't forget your other tools. The oil analysis trend on an engine I owned showed a sudden slight increase in wear. So we grabbed another tool, and scoped the cylinders, which showed suspicious markings. So we grabbed another tool, and pulled cylinders, found further wear issues. General consensus, given the indications and time on the engine, was to do an overhaul. Just my experience. I use Blackstone, no complaints.
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  #14  
Old 05-29-2019, 07:10 AM
Charlie Sisk Charlie Sisk is offline
 
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A very interesting thread on this a while back on the Beech forum....
https://www.beechtalk.com/forums/vie...?f=37&t=120036
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  #15  
Old 05-30-2019, 05:20 AM
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Yes, yes,yes.
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