I'v started to develop a lifter tick on my 2006 5.3. I ran a B&G engine flush through it and it helped make it not so often.
What is better? A heavier oil (10/30-20/50) to help the lifter keep pressure or a lighter oil (0/20-5/30) for quicker lubrication?
Any Lucas oil additive users?
When it does start ticking a quick acceleration from a stop, 1 or 2 times bringing the oil pressure past 40 psi, usually quiets it.

 

What is your oil pressure at idle and when running? How many miles are on the engine? When it starts ticking is the oil pressure low?