It appears two assumptions are made, regarding contaminates in the pan and contaminates circulated through the engine: 1) an assumption is made that everything in the pan drains out. 2) in the case for draining cold it appears an assumption is also made, that contaminates circulated through out the engine do not remain in the various passages but also collect in the pan awaiting draining.
In my mind oil/contaminates in the engine oil passages, for the most part remain there and do not drain ..... hot or cold. In addition, the best way to insure contaminates in the sump oil are drained is to drain hot, while the contaminates are still suspended through out the oil. Hot or cold ..... some oil always remains in the sump. In the case of draining cold the remaining oil would/could contain collected settled contaminates rather than uniformly distributed suspended contaminates.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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