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Spray a s**t load of brake cleaner around the inlet. See if it reacts. Is also be doing a leak down test as said by @NorthloopCup oil out the breather isn't a good sign.
I was more meaning:
What age
Engine
Mileage
When were the belts done and who by
If it's a diesel what fuel pressure is it showing
Any misfires
Any smoke
It's not me not liking the ramp rates, it's the engines. 30 seconds of flat out with a not very good fan is asking for trouble. And when I'm running a £10k+ engine, I'd sooner go somewhere with a decent roller setup.