Did I Pass The "Tea Kettle" Blowby Test? And How Does The Engine Sound?

[Squiggle Dog]

This morning I decided to try out the "tea kettle" blowby test on my 1980 W116 300SD. The oil cap didn't fly off, so that's good. It actually just sat there on the valve cover. When I removed the cap, I couldn't see any smoke coming out at all.

I did the test with the engine cold. Is this the proper way to do it, or should I have done the test with the engine hot? Also, does the engine sound like it idles fine? No injector nailing or anything? The engine has over 315,000 miles. I use Amsoil Synthetic 15W40 Heavy Duty Diesel & Marine Oil and B99 biodiesel year-round (thankfully, it's cheaper than diesel).

Here is the video: 300sdblowby - YouTube