Quick answer
Consider oil additives if you detect small leaks, gunky deposits, or hear low-level engine noise. Otherwise, high-quality motor oil alone might suffice for a well-maintained vehicle.
Detailed answer
Oil additives are a targeted solution—like a specialized medicine for your engine’s mild ailments. If you’re already diligent with oil changes and the car runs quietly, adding more chemistry might be unnecessary. Still, a high-mileage formula with seal conditioners could preempt leaks in an aging vehicle. Ultimately, it boils down to a cost-benefit decision: do you see mild symptoms that a specialized additive could fix or prevent? If so, go for it. If not, keep it simple.
