I think I have a bad injector. Am I right?

[Higbean]

Engine runs really smooth. Mileage is in the toilet. I've started to notice a putrid smell from the blow by tube after making a long run on the freeway. I've been trying to figure out what is going on with the fuel mileage and was thinking injectors but it runs really good. Engine has around 160,000. Could it be that one or more injectors are dripping, running down the cylinder walls and causing the smell? The smell goes away after a few days of driving around town. I'm running Rotella and I've read it can stink pretty good too. While I'm thinking about it, I'm going to go sniff my dipstick.

[1992gen1_fan]

Any haze in the exhaust?

[Higbean]

Yes there is a slight haze at idle.

[diesel freak01]

Is the crankcase overfull? If not it's not leaking passed the rings. Is the oil an odd color?

[Higbean]

No. Crank case was 1/2 a quart low and black. I changed the oil today to Delo 15-40.

[1992gen1_fan]

Most injection shops will test the injectors for free, might be worth doing.