When should I start utilizing high mileage oil for my vehicle? As my car ages and accumulates more miles, is there a definitive threshold that signals the transition to this specialized lubricant? At what point do the wear and tear on the engine components necessitate a more robust oil formulation designed to address the unique challenges of older engines? Is it after reaching a particular mileage milestone—perhaps around 75,000 miles—or should other factors be considered, such as the vehicle’s overall performance, maintenance history, or driving conditions? Furthermore, how can I ascertain whether the existing oil is no longer adequate for sustaining engine health? Do signs such as increased oil consumption, diminished fuel efficiency, or the appearance of engine noise serve as indicators that it’s time to switch? In essence, what comprehensive criteria should drive my decision to embrace high mileage oil, ensuring optimal engine function as my vehicle continues its journey through the years?