why is the engine ticking on 1999 GMC Suburban 2500

why is the engine ticking each time I start it?

Asked by for the 1999 GMC Suburban 2500
valve lifters are not holding pressure when sitting for a period of time. try changing the oil and use an additive for lifters and see if that helps before talking about replacing the valve lifters.

Thank you very much Roy. Do you think it would be good to try a synthetic oil?