Big_Bird

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Mobil 1 MX2T mixed at 32:1. Gas was 93 octane.

The engine was run for 6 hrs and almost 3 gal of fuel was burned. Engine
temperatures fluctuated 210-220 degrees. Outside temperature was 43-45
degrees. Engine rpm with a 24 x 10 prop was 5880-5910 down from 6000 with
most other oils.

After 6 hrs of running at full throttle, the piston was covered with hard
black carbon 5-10 thousands thick. A 1/2 inch band running from the intake
port to the center of the piston was shiny clean. The piston edge close to
the intake port had a 1/8" clean area and the piston edge next to the
exhaust port also had a clean band 1/8" wide. Otherwise the entire piston
was covered with carbon. Carbon buildup also was starting on the upper edge
of the ring and in the cylinder dome. This carbon buildup was very similar
to Amsoil Saber 100:1 mixed at 50:1 and Amsoil Dominator mixed at 50:1. The
only difference was the color of the carbon. Mobile carbon was black and
Amsoil carbon had a brownish cast. Both carbons were very hard.