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Have a real good look for leaks. My understanding of a sooty exhaust is that it's caused by running rich:

Check the gasket between the oil filter housing and block and the two rings on the oil cooler, also attached to the oil filter housing.

Have good look where the gearbox joins the block. If you see any oil weeping there, the rear main crank seal has gone. You will find it behind the flywheel.

Do similar around the aux belt to see if the front crank bearing is OK.

Make sure the rocker cover leak is small, they leak a lot more than you'd expect.

The sump gasket can also leak, but as it at the bottom of the engine oily reside there often comes from a leak higher above.

Finally check the crank position sensor, on the front of the block.
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