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Not likely to help, if you added it to the oil guaranteed not to help. It is best to have an injector wrench like this one. But you can also use a 19MM/3/4" open end wrench. They are all a PITA to get to, some are worse, If it were me I would access and "test loosen" and snug back down as...

Like Mark it sounds like a failing injector to me, bust each line and see if it goes away on one of them. IMHO it is not "tinny" enough to be a lifter.

AS RWH said it sounds like it is idling too slow

I add a little Stanadyne "lubricity" formula to each tank of fuel, they built the IP, I figure they know what's best for it.

Sound great! Now change the fluid and filter in the trans and the fluid in the gear hubs, differentials, power steering and brakes to reduce the risk of having issues with those items.

Now it is likely you have some type of cantamination in that "lazy" lifter, hopefully a good oil change and some run time will clear it up or if not you have cost yourself some unnecessary repairs.

I do not mean to be harsh BUT the very first thing you should have done was change the oil, if you bought that truck from the gov. you have NO idea how old it was or even if they used the right oil to begin with, not wanting to contaminate it later is no excuse, in that case just change it...

I volunteered to moderate the new FAV forum to reduce the increased work load to the moderators and admin.

You have changed the oil and filter yes?

If you had an injector line rust through you would loose a cylinder (read engine miss) and you would have fuel coming out of the busted line, not likely the present problem.

Do not change the injectors before troubleshooting them, open each injector line while it is running, IF there is a bad injector the knock will stop when the bad injectors line is "broken" then just replace that injector. I have heard several Detroits with bad injectors and the knock was always...

Sounds like a lifter to me..