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My guess would be intesnse heat is what degrades the gaskets. Because the place between the cylinders has the least amount of mass it gets hotter degrading quicker. Using the highest quality and heat rated gasket available may help extend the frequency between replacing them and reduce the...

Ah, sounds like you are probably correct, I thought you meant the intake was blocked. Makes sense the soot is burnt fuel from the adjacent cylinder building there because at engine speed the turbo holds it back like you mentioned. Hopefully a new gasket is all that is needed.

It would seem to me that if the #6 intake port is blocked then air from the cylinder would not be moving out the intake side. That intake being blocked leads me to believe that large amounts of air is able to enter #6 from somewhere else during the intake stroke. Not drawing air in through the...

So no air flow into #6?

post up in the parts wanted classified.

I would guess the cooler exhaust manifold is due to lack of firing in that cylinder with the cause being not enough compression. The rough running is because of misfire of at least that cylinder throwing the engine out of balance. The head needs to come off and inspection performed to know...

Usually just pulling the dipstick will tell. After water in the crankcase gets mixed up by the crankshaft the oil will look like chocolate milk instead of like new or used oil.

Sometimes a leaking head gasket or block/head damage will cause the engine oil to look like chocolate milk from coolant entering the block. Compression test will answer alot.

white or blue smoke from a combustion engine usually indicates oil is burning. Black smoke usually indicates fuel is burning. Diesels & two strokes can be tricky because the fuel contains oil.