nigelspeedy
Well Known Member
My engine is fitted with a filter so by rights I could change the oil at 50 hours but given that it is the single most expensive part of the plane changing it at 25 hours seems like a reasonable idea. Since new I have sent a sample away for analysis. Well all good intentions but SnF came up when I had 20 hours on the oil and I was in a rush getting ready so I pressed on to 50 hours before the next change. Turns out engine oil gets dirty as you can see in the attached plot. Pretty normal but the second to last sample is the one with 50 hours on it then back to normal with a 25 hour change at the end. So I guess the good news is that even small changes are picked up. What I am not sure of is the major source for each of the different metals detected. Seriously where does Lycoming use Silver in an IO-360?
So for my continuing education and recreation where does the majority of the metals come from.
While the graph for an individual engine will show variations from its normal state are there any published absolute limits for these engines?
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Cheers
Nigel
So for my continuing education and recreation where does the majority of the metals come from.
While the graph for an individual engine will show variations from its normal state are there any published absolute limits for these engines?
Cheers
Nigel