back in the day, 100,00 miles was about time to start putting some STP in the engine oil. Or at least that's what my dad did. Sure got rid of any ticking coming from the engine.
Yeah. You pull the valve covers on an engine in the 70s with 100K on it that had oil changed ever 3K and the sludge and build up was impressive. Pull the valve covers on an engine today with 100K that had 10K oil changes with synthetic and it's night and day difference. People aren't wearing out engines.
