How long do glow plugs last in diesel engines?

Hey there! That's a great question about diesel engine maintenance. From what I've found, glow plugs are actually pretty durable components in diesel engines. On average, they should last around 200,000+ miles when using good quality diesel fuel.

Some sources mention they typically last about 3-4 years regardless of mileage, while others say they can last decades and thousands of hours in industrial applications. The lifespan can vary quite a bit depending on factors like fuel quality, driving conditions, and the specific engine design.

The good news is that glow plugs don't need frequent replacement - they're designed to be long-lasting components. If you find yourself replacing them annually, that might indicate an underlying issue with your engine that needs attention.