Making sense of engine hours: why 800 on a gas outboard can be 'more' than 4,000 on a diesel

Hours scare buyers more than they should — and a raw number means little without context. Here's how the YachtBazar team reads them.

Diesels and gas engines live on totally different clocks. A well-kept marine diesel is often just getting comfortable at a few thousand hours; many run far longer with basic care. A gas outboard or sterndrive works harder per hour and typically wears faster, so a high-hour gas engine deserves more scrutiny than a high-hour diesel.

So a gas 2-stroke at 800 hours and a diesel at 4,000 can both be fine — or both be tired. What matters more than the number:

• Hours per year. Roughly 50 a season is normal-ish. Very low hours can mean an engine that sat and rotted, not a gem.

• Maintenance records. Oil changes, impellers, fuel filters. No paper trail, assume nothing was done.

• How it ran, not just sat. Engines hate sitting. Ask about winterizing.

• A compression or leak-down test on gas, and a survey/oil analysis on diesel.

A good rule of thumb: buy the maintenance history, not the hour meter. And confirm the meter actually works — they get swapped and they fail.

What hour numbers have you seen that turned out way better or worse than they looked?