Bill -

 

>Curious though, do you know why the silicon dropped by almost half over the last 100 hours?

>The extra 2 quarts of oil might explain it.

 

I just read an article by Mike Busch saying that the silicone in many sealants can find its way into the oil and silicone level will drop after a few oil changes. My engine was freshly rebuilt before the first flight, so that makes sense. Also, I installed a new prop shortly before my last oil change. I had to add a quart to make up for the oil that filled the prop hub. Adding fresh oil dilutes the dirty oil, bringing my numbers down. However, I think Blackstone takes that into account since they ask for the amount of make-up oil added between changes. BTW, I change my oil and filter at 50-hour intervals and typically add 3 quarts between changes. That works out to 1 quart every 17 hours.

 

-Adam Molny