My truck was making a ticking noise. From what I have read it was probably a injector. I made a 1 liter batch of bio diesel at home and put it in the tank and the ticking disappeared. My engine is so quiet now. I have run power service and Marvel Mystery oil as well a commercial b20. None of those made a noticeable difference. I thought this was interesting.

 

I've also heard of members changing their fuel filters and priming the canister with some Sea*Foam with great results as well.

Greg

 

My truck runs more quiet with Redline Diesel Fuel Catalyst, Power Service, and Amsoil Diesel Additive.....

 

The additives are masking the issue due to change in fuel burn rate. You still have a injector out of spec in all probability, expecially if noticabe diesel knock. It took mine over 40 K miles to go from slight tick to full blown problem.