Why driving at very low RPMs can damage your engine

Driving an engine at very low RPMs under high load—often called "lugging"—can cause more wear than active driving. While operating between 1,300 and 1,500 RPM may seem like a fuel-saving or gentle mode, it can create critical cylinder pressure and a risk of premature ignition, potentially leading to expensive repairs. Why low RPMs increase engine wear The assumption that lower crankshaft speeds always mean less friction is inaccurate when high loads are involved. Accelerating hard at low RPMs causes combustion chamber pressure to peak. For modern turbocharged engines, this increases the risk of detonation and piston ring damage. "When driving at ultra-low RPMs, the oil pump does not operate at full capacity, while the pressure on the crankshaft bearings is at its maximum. This can lead to a rupture of the protective oil film and direct metal-to-metal contact."