In article UD21c.165927$uV3.715301@attbi_s51,
Michael 182 wrote:
TIO-540 in '79 TR182. I had a top overhaul 68 hours ago. Changed out the
mineral oil at 18 hours and just changed the 15-50 oil at 50 hours. Chromium
is 30.4. I suspect that new cylinders will cause a higher than normal
Chromium for a while, but is this unusally high?

I have cermichrome cylinders in an IO-540 with about 870 hours. I got
41ppm chrome and I noted that I had cermichrome cyls (AOA note 993) and
they returned "all values appear normal".

For context that's about twice as much as iron, 8 times as much as Al,
and 10 times as much as Silicon.

--
Ben Jackson

http://www.ben.com/