On cold start have recurring tap, tap,tap,tap,tap from engine. Dissipates quickly. Relatively new occurrence. Engine otherwise seems to be running good. When hot oil temp around 175 degrees. Oil pressure low 50's PSI in normal city conditions. Water temp normal. Oil levels normal.
Is this symptomatic of stuck lifter? Or, another issue perhaps?
If lifter issue, is there risk of further damaging engine?
Will highway driving cause catastrophic failure?
I know it's difficult to answer without hearing noise or hooking up diagnostics, but appreciate opinions nonetheless.