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The motor oil could be a sign that the injectors are letting oil by and you need at a minimum of a seal job.
P0335 is the cam sensor. You said you took care of that.
p2614 is cam sensor voltage. There could be a pigtail issue sense you have two code for it. I would change the pigtail out since you already changed the sensor.
p0678 (presuming that is the code since first digit is missing) is Cylinder 8 glow plug fault. You stated you changed the glow plugs so that should be resolved.
Since you are getting the no start, change the pigtail to the cam sensor and see if the issue resolves. With the engine not seeing that sensor, it doesn't know when to fire the injectors.
Also be ready for the need for a seal job since you had oil on the glow plugs.
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