Most of the underlying causes for why your engine is ticking in the first place can be blamed on your motor oil. Running contaminated, burnt, a low volume, or the wrong viscosity of engine oil will very quickly prompt a lifter tick to appear. Therefore, one easy way to fix lifter ticking is by changing or topping up the oil, as well as ensuring that you're using the right type of engine oil. While you're there, make sure that you also swap out the oil filter. If not, and if there's damage to the valve lifters, rocker arms, or pushrods, you'll have to replace or re-adjust them.