Since your is a early 24v then you do not have a catch bottle like the later 24v trucks. If you look right in front of your injection pump on the radiator side of the timing case you will see a round plastic piece with a hose coming off of it and running down in front of the motor. That is your blow-by tube on the 24v's.
mine doesnt use enough to need to add any between changes,the only time i get anything out the blowby is after towing 10000+ lb in OD at 65+ mph in the mountains sustaining 45-55psi of boost for a few minutes at a time.I change mine every 3-6000 miles.
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