Lifters Lash

Lash adjuster replacement?

2002 Dodge Intrepid 2.7. 65000 miles. What is the deciding factor to determine if the lash adjusters need to be replaced ??
Symptoms: Lifter tick until warm. Valve covers, windage tray, oil pan sludge. Using synthethic for 2 yrs @ 3000 mile intervals. Some lash adjuster have little or no linear or axial [...]