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What oil level were you running?
I hate to see 3 cylinders being pulled...
If I read correctly, 4 out of 5 mechanics said to monitor - what was the result? How many hours did you monitor? What were the compression's? If you lowered your oil level a little, did this change your oil consumption?
A friend of mine who used to have his own engine overhaul shop (and whom I respect his knowledge) told me on the IO 360 not to get my underwear in a bunch if I have a low compression on a single cylinder. He said the engines were known to have the rings turn and line up, causing compression loss. He indicated that if it was blow-by into the crank, just keep running it and check again in 20 hours (if all other indications were good of course). He said he would often see the compression go back up as the rings turn a little. Not saying this is what happened to you, but if you do have blow-by past the rings, it pressurizes the case and can push oil out the breather. Did you have more than usual oil on the belly? Did you have the turbo boroscoped to look for any evidence of oil leakage?
It just seems weird that this all of sudden happened after the annual as you indicated.
Food for thought for the future. I don't mind changing cylinders...I just don't like paying for them.
Jeff
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