On Mon, 29 Jan 2007 13:49:26 -0600, "Dan Luke"
wrote:


wrote:

Definitely have an A&P borescope that engine. Broken ring maybe.

Talked to my mechanic this morning. He said not to worry; the dirty oil is
from the oil cooler and its plumbing, which don't get drained when the oil is
changed.

He said I would have noticed this before if I had ever checked it two hours
after a change. Since I check the oil before every flight, it seems I would
have noticed the oil's turning black this soon before.

Should I pay to have the cylinders 'scoped?

Dan,

I have a Lyc IO360 and the oil definitely does not turn black after two
hours. At two hours, it is still so light that I have trouble reading the
dipstick!

And I also have an oil cooler that does not get drained during the oil
change.

Aeroshell 15W50


--ron