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When I was in the navy on an Newport class LST (the USS Saginaw, LST1188, I was an enginman) our ship had ALCO's (16-251's for mains, 8-251 for genorators).  Those engines were natural oil burners (manuals said so) because the cyl walls had tiny dimples in them.  Some other Newport class LST's had some type of GM.  They had a hybrid blower / turbo.  At lower speeds it was a blower, at higherspeeds it unclutched from the engine and became a turbo.  However,  navy is constantly training while under way, so they constantly change speed. This caused the clutches to have a high failure rate so the ALCO's were a lot more reliable.  Just before transfering off te Saginaw we herd they were experimenting with eliminating the cluch. The GM's are 2 strokes without crank case scavaging ( all GM diesels  with the exception of light and medium duty ones are) so they must have a blower at low speeds until they have enough exaust preasure to spin the turbo.  The alco is a 4 stroke so the turbo is only for power boost and it runs without it at low speeds.  Another sorce of smoke on ALCO's is crank case scavaging.  Instead of sucking crank case fumes into the engine to be burned as most engines do (there was a lot of it due to those dimples) they used an scavaging ejector powered by air presure from the blower to blow it out another exaust.  These were a sorce of much grief for us since the simply discharged into the engine room exaust and put lots of oil in them, causing a fire on one of the LST's
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