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First thing I would do is scrap the 20 weight oil and go to a 30 (or perhaps 0W40 if you live in a warm climate). Seriously...on these newer engines I've seen horrible valvetrain noise go away with better oil. Would be something cheap to try first. Unfortunately, my dad wasted $1,500 before he figured that out.
Xw30 or Xw40 on a 5.7L with MDS is a sure fire way to cause problems and set codes.
OP would be better off trying Mobil 1 5w20, that seems to help a number of folks with the tick. I've run Mobil 1 5w20 since about 1,200 miles and have no tick.
There's also nothing wrong with Xw20 oil and there's nothing that says a thicker oil is a better oil. These engines were engineered for the specific oil flow properties provided by the Xw20 oil. The 6.4L, while based on the 5.7L, does not share the same lubrication parts. Different oil pump, different lifters, different MDS solenoid, etc.
Xw20 has been around for long enough to prove itself, Xw30 had the same reception when it became the norm, everyone was used to Xw40 and thought Xw30 was too thin and would cause damage and short engine life.
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