Cat D2 5J Engine slobbering

yes warm it up and work it not hard but make it work.

Make it work

Slobbering is a good sign it has been babied, been setting awhile or the regulator (thermostat) is opening too soon and can not come up to operating temp. A standard 175*F thermostat starts to open at ~166*F and mid open at ~175*F and wide open at 188*F ....
running temp .... Anything lower than a continuous ~168*F will cause the exhaust stack to start slobbering - not hot enough to keep condensation from forming. Run the puppy water out of it to get the temp on step but keep your eye on the gauge. Been babied or run underpowered loads up the engine oil, head and exhaust with carbon. If it has been setting for a long time the cylinder walls dry out a bit and the rings will need to reseat ... puppy water extraction helps with all these issues.
Once the engine stops slobbering the exhaust may take several hours to clear. Gaskets, including the head gasket, may begin to weep and leak. Clean and keep a eye out and again after the heat comes up the gaskets may begin to re seal too. It wants to run.
Other considerations if that don't help are make sure the injectors have a good spray, valve lash and injection timing are in spec.

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put some injector cleaner in it , and hook it to a disk or something and the crap out it, and it will cleanup and then worry about any issues then